chore: prepare for PR

app/Livewire/Settings/Advanced.php

@@ -95,7 +95,9 @@ public function submit()
                     // Check if it's valid CIDR notation
                     if (str_contains($entry, '/')) {
                         [$ip, $mask] = explode('/', $entry);
-                        if (filter_var($ip, FILTER_VALIDATE_IP) && is_numeric($mask) && $mask >= 0 && $mask <= 32) {
+                        $isIpv6 = filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6) !== false;
+                        $maxMask = $isIpv6 ? 128 : 32;
+                        if (filter_var($ip, FILTER_VALIDATE_IP) && is_numeric($mask) && $mask >= 0 && $mask <= $maxMask) {
                             return $entry;
                         }
                         $invalidEntries[] = $entry;
@@ -111,7 +113,7 @@ public function submit()
                     $invalidEntries[] = $entry;
 
                     return null;
-                })->filter()->unique();
+                })->filter()->values()->all();
 
                 if (! empty($invalidEntries)) {
                     $this->dispatch('error', 'Invalid IP addresses or subnets: '.implode(', ', $invalidEntries));
@@ -119,13 +121,15 @@ public function submit()
                     return;
                 }
 
-                if ($validEntries->isEmpty()) {
+                if (empty($validEntries)) {
                     $this->dispatch('error', 'No valid IP addresses or subnets provided');
 
                     return;
                 }
 
-                $this->allowed_ips = $validEntries->implode(',');
+                $validEntries = deduplicateAllowlist($validEntries);
+
+                $this->allowed_ips = implode(',', $validEntries);
             }
 
             $this->instantSave();

app/Rules/ValidIpOrCidr.php

@@ -45,7 +45,10 @@ public function validate(string $attribute, mixed $value, Closure $fail): void
 
                 [$ip, $mask] = $parts;
 
-                if (! filter_var($ip, FILTER_VALIDATE_IP) || ! is_numeric($mask) || $mask < 0 || $mask > 32) {
+                $isIpv6 = filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6) !== false;
+                $maxMask = $isIpv6 ? 128 : 32;
+
+                if (! filter_var($ip, FILTER_VALIDATE_IP) || ! is_numeric($mask) || $mask < 0 || $mask > $maxMask) {
                     $invalidEntries[] = $entry;
                 }
             } else {

bootstrap/helpers/shared.php

@@ -1416,24 +1416,48 @@ function checkIPAgainstAllowlist($ip, $allowlist)
             }
 
             $mask = (int) $mask;
+            $isIpv6Subnet = filter_var($subnet, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6) !== false;
+            $maxMask = $isIpv6Subnet ? 128 : 32;
 
-            // Validate mask
+            // Validate mask for address family
-            if ($mask < 0 || $mask > 32) {
+            if ($mask < 0 || $mask > $maxMask) {
                 continue;
             }
 
-            // Calculate network addresses
+            if ($isIpv6Subnet) {
-            $ip_long = ip2long($ip);
+                // IPv6 CIDR matching using binary string comparison
-            $subnet_long = ip2long($subnet);
+                $ipBin = inet_pton($ip);
+                $subnetBin = inet_pton($subnet);
 
-            if ($ip_long === false || $subnet_long === false) {
+                if ($ipBin === false || $subnetBin === false) {
-                continue;
+                    continue;
-            }
+                }
 
-            $mask_long = ~((1 << (32 - $mask)) - 1);
+                // Build a 128-bit mask from $mask prefix bits
+                $maskBin = str_repeat("\xff", (int) ($mask / 8));
+                $remainder = $mask % 8;
+                if ($remainder > 0) {
+                    $maskBin .= chr(0xFF & (0xFF << (8 - $remainder)));
+                }
+                $maskBin = str_pad($maskBin, 16, "\x00");
 
-            if (($ip_long & $mask_long) == ($subnet_long & $mask_long)) {
+                if (($ipBin & $maskBin) === ($subnetBin & $maskBin)) {
-                return true;
+                    return true;
+                }
+            } else {
+                // IPv4 CIDR matching
+                $ip_long = ip2long($ip);
+                $subnet_long = ip2long($subnet);
+
+                if ($ip_long === false || $subnet_long === false) {
+                    continue;
+                }
+
+                $mask_long = ~((1 << (32 - $mask)) - 1);
+
+                if (($ip_long & $mask_long) == ($subnet_long & $mask_long)) {
+                    return true;
+                }
             }
         } else {
             // Special case: 0.0.0.0 means allow all
@@ -1451,6 +1475,67 @@ function checkIPAgainstAllowlist($ip, $allowlist)
     return false;
 }
 
+function deduplicateAllowlist(array $entries): array
+{
+    if (count($entries) <= 1) {
+        return array_values($entries);
+    }
+
+    // Normalize each entry into [original, ip, mask]
+    $parsed = [];
+    foreach ($entries as $entry) {
+        $entry = trim($entry);
+        if (empty($entry)) {
+            continue;
+        }
+
+        if ($entry === '0.0.0.0') {
+            // Special case: bare 0.0.0.0 means "allow all" — treat as /0
+            $parsed[] = ['original' => $entry, 'ip' => '0.0.0.0', 'mask' => 0];
+        } elseif (str_contains($entry, '/')) {
+            [$ip, $mask] = explode('/', $entry);
+            $parsed[] = ['original' => $entry, 'ip' => $ip, 'mask' => (int) $mask];
+        } else {
+            $ip = $entry;
+            $isIpv6 = filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6) !== false;
+            $parsed[] = ['original' => $entry, 'ip' => $ip, 'mask' => $isIpv6 ? 128 : 32];
+        }
+    }
+
+    $count = count($parsed);
+    $redundant = array_fill(0, $count, false);
+
+    for ($i = 0; $i < $count; $i++) {
+        if ($redundant[$i]) {
+            continue;
+        }
+
+        for ($j = 0; $j < $count; $j++) {
+            if ($i === $j || $redundant[$j]) {
+                continue;
+            }
+
+            // Entry $j is redundant if its mask is narrower/equal (>=) than $i's mask
+            // AND $j's network IP falls within $i's CIDR range
+            if ($parsed[$j]['mask'] >= $parsed[$i]['mask']) {
+                $cidr = $parsed[$i]['ip'].'/'.$parsed[$i]['mask'];
+                if (checkIPAgainstAllowlist($parsed[$j]['ip'], [$cidr])) {
+                    $redundant[$j] = true;
+                }
+            }
+        }
+    }
+
+    $result = [];
+    for ($i = 0; $i < $count; $i++) {
+        if (! $redundant[$i]) {
+            $result[] = $parsed[$i]['original'];
+        }
+    }
+
+    return $result;
+}
+
 function get_public_ips()
 {
     try {

tests/Feature/IpAllowlistTest.php

@@ -86,7 +86,7 @@
     expect(checkIPAgainstAllowlist('192.168.1.1', ['192.168.1.0/-1']))->toBeFalse(); // Invalid mask
 });
 
-test('IP allowlist with various subnet sizes', function () {
+test('IP allowlist with various IPv4 subnet sizes', function () {
     // /32 - single host
     expect(checkIPAgainstAllowlist('192.168.1.1', ['192.168.1.1/32']))->toBeTrue();
     expect(checkIPAgainstAllowlist('192.168.1.2', ['192.168.1.1/32']))->toBeFalse();
@@ -96,16 +96,98 @@
     expect(checkIPAgainstAllowlist('192.168.1.1', ['192.168.1.0/31']))->toBeTrue();
     expect(checkIPAgainstAllowlist('192.168.1.2', ['192.168.1.0/31']))->toBeFalse();
 
-    // /16 - class B
+    // /25 - half a /24
+    expect(checkIPAgainstAllowlist('192.168.1.1', ['192.168.1.0/25']))->toBeTrue();
+    expect(checkIPAgainstAllowlist('192.168.1.127', ['192.168.1.0/25']))->toBeTrue();
+    expect(checkIPAgainstAllowlist('192.168.1.128', ['192.168.1.0/25']))->toBeFalse();
+
+    // /16
     expect(checkIPAgainstAllowlist('172.16.0.1', ['172.16.0.0/16']))->toBeTrue();
     expect(checkIPAgainstAllowlist('172.16.255.255', ['172.16.0.0/16']))->toBeTrue();
     expect(checkIPAgainstAllowlist('172.17.0.1', ['172.16.0.0/16']))->toBeFalse();
 
+    // /12
+    expect(checkIPAgainstAllowlist('172.16.0.1', ['172.16.0.0/12']))->toBeTrue();
+    expect(checkIPAgainstAllowlist('172.31.255.255', ['172.16.0.0/12']))->toBeTrue();
+    expect(checkIPAgainstAllowlist('172.32.0.1', ['172.16.0.0/12']))->toBeFalse();
+
+    // /8
+    expect(checkIPAgainstAllowlist('10.255.255.255', ['10.0.0.0/8']))->toBeTrue();
+    expect(checkIPAgainstAllowlist('11.0.0.1', ['10.0.0.0/8']))->toBeFalse();
+
     // /0 - all addresses
     expect(checkIPAgainstAllowlist('1.1.1.1', ['0.0.0.0/0']))->toBeTrue();
     expect(checkIPAgainstAllowlist('255.255.255.255', ['0.0.0.0/0']))->toBeTrue();
 });
 
+test('IP allowlist with various IPv6 subnet sizes', function () {
+    // /128 - single host
+    expect(checkIPAgainstAllowlist('2001:db8::1', ['2001:db8::1/128']))->toBeTrue();
+    expect(checkIPAgainstAllowlist('2001:db8::2', ['2001:db8::1/128']))->toBeFalse();
+
+    // /127 - point-to-point link
+    expect(checkIPAgainstAllowlist('2001:db8::0', ['2001:db8::/127']))->toBeTrue();
+    expect(checkIPAgainstAllowlist('2001:db8::1', ['2001:db8::/127']))->toBeTrue();
+    expect(checkIPAgainstAllowlist('2001:db8::2', ['2001:db8::/127']))->toBeFalse();
+
+    // /64 - standard subnet
+    expect(checkIPAgainstAllowlist('2001:db8:abcd:1234::1', ['2001:db8:abcd:1234::/64']))->toBeTrue();
+    expect(checkIPAgainstAllowlist('2001:db8:abcd:1234:ffff:ffff:ffff:ffff', ['2001:db8:abcd:1234::/64']))->toBeTrue();
+    expect(checkIPAgainstAllowlist('2001:db8:abcd:1235::1', ['2001:db8:abcd:1234::/64']))->toBeFalse();
+
+    // /48 - site prefix
+    expect(checkIPAgainstAllowlist('2001:db8:1234::1', ['2001:db8:1234::/48']))->toBeTrue();
+    expect(checkIPAgainstAllowlist('2001:db8:1234:ffff::1', ['2001:db8:1234::/48']))->toBeTrue();
+    expect(checkIPAgainstAllowlist('2001:db8:1235::1', ['2001:db8:1234::/48']))->toBeFalse();
+
+    // /32 - ISP allocation
+    expect(checkIPAgainstAllowlist('2001:db8::1', ['2001:db8::/32']))->toBeTrue();
+    expect(checkIPAgainstAllowlist('2001:db8:ffff:ffff::1', ['2001:db8::/32']))->toBeTrue();
+    expect(checkIPAgainstAllowlist('2001:db9::1', ['2001:db8::/32']))->toBeFalse();
+
+    // /16
+    expect(checkIPAgainstAllowlist('2001:0000::1', ['2001::/16']))->toBeTrue();
+    expect(checkIPAgainstAllowlist('2001:ffff:ffff::1', ['2001::/16']))->toBeTrue();
+    expect(checkIPAgainstAllowlist('2002::1', ['2001::/16']))->toBeFalse();
+});
+
+test('IP allowlist with bare IPv6 addresses', function () {
+    expect(checkIPAgainstAllowlist('2001:db8::1', ['2001:db8::1']))->toBeTrue();
+    expect(checkIPAgainstAllowlist('2001:db8::2', ['2001:db8::1']))->toBeFalse();
+    expect(checkIPAgainstAllowlist('::1', ['::1']))->toBeTrue();
+    expect(checkIPAgainstAllowlist('::1', ['::2']))->toBeFalse();
+});
+
+test('IP allowlist with IPv6 CIDR notation', function () {
+    // /64 prefix — issue #8729 exact case
+    expect(checkIPAgainstAllowlist('2a01:e0a:21d:8230::1', ['2a01:e0a:21d:8230::/64']))->toBeTrue();
+    expect(checkIPAgainstAllowlist('2a01:e0a:21d:8230:abcd:ef01:2345:6789', ['2a01:e0a:21d:8230::/64']))->toBeTrue();
+    expect(checkIPAgainstAllowlist('2a01:e0a:21d:8231::1', ['2a01:e0a:21d:8230::/64']))->toBeFalse();
+
+    // /128 — single host
+    expect(checkIPAgainstAllowlist('2001:db8::1', ['2001:db8::1/128']))->toBeTrue();
+    expect(checkIPAgainstAllowlist('2001:db8::2', ['2001:db8::1/128']))->toBeFalse();
+
+    // /48 prefix
+    expect(checkIPAgainstAllowlist('2001:db8:1234::1', ['2001:db8:1234::/48']))->toBeTrue();
+    expect(checkIPAgainstAllowlist('2001:db8:1235::1', ['2001:db8:1234::/48']))->toBeFalse();
+});
+
+test('IP allowlist with mixed IPv4 and IPv6', function () {
+    $allowlist = ['192.168.1.100', '10.0.0.0/8', '2a01:e0a:21d:8230::/64'];
+
+    expect(checkIPAgainstAllowlist('192.168.1.100', $allowlist))->toBeTrue();
+    expect(checkIPAgainstAllowlist('10.5.5.5', $allowlist))->toBeTrue();
+    expect(checkIPAgainstAllowlist('2a01:e0a:21d:8230::cafe', $allowlist))->toBeTrue();
+    expect(checkIPAgainstAllowlist('2a01:e0a:21d:8231::1', $allowlist))->toBeFalse();
+    expect(checkIPAgainstAllowlist('8.8.8.8', $allowlist))->toBeFalse();
+});
+
+test('IP allowlist handles invalid IPv6 masks', function () {
+    expect(checkIPAgainstAllowlist('2001:db8::1', ['2001:db8::/129']))->toBeFalse(); // mask > 128
+    expect(checkIPAgainstAllowlist('2001:db8::1', ['2001:db8::/-1']))->toBeFalse();  // negative mask
+});
+
 test('IP allowlist comma-separated string input', function () {
     // Test with comma-separated string (as it would come from the settings)
     $allowlistString = '192.168.1.100,10.0.0.0/8,172.16.0.0/16';
@@ -134,14 +216,21 @@
     // Valid cases - should pass
     expect($validate(''))->toBeTrue(); // Empty is allowed
     expect($validate('0.0.0.0'))->toBeTrue(); // 0.0.0.0 is allowed
-    expect($validate('192.168.1.1'))->toBeTrue(); // Valid IP
+    expect($validate('192.168.1.1'))->toBeTrue(); // Valid IPv4
-    expect($validate('192.168.1.0/24'))->toBeTrue(); // Valid CIDR
+    expect($validate('192.168.1.0/24'))->toBeTrue(); // Valid IPv4 CIDR
-    expect($validate('10.0.0.0/8'))->toBeTrue(); // Valid CIDR
+    expect($validate('10.0.0.0/8'))->toBeTrue(); // Valid IPv4 CIDR
     expect($validate('192.168.1.1,10.0.0.1'))->toBeTrue(); // Multiple valid IPs
     expect($validate('192.168.1.0/24,10.0.0.0/8'))->toBeTrue(); // Multiple CIDRs
     expect($validate('0.0.0.0/0'))->toBeTrue(); // 0.0.0.0 with subnet
     expect($validate('0.0.0.0/24'))->toBeTrue(); // 0.0.0.0 with any subnet
     expect($validate(' 192.168.1.1 '))->toBeTrue(); // With spaces
+    // IPv6 valid cases — issue #8729
+    expect($validate('2001:db8::1'))->toBeTrue(); // Valid bare IPv6
+    expect($validate('::1'))->toBeTrue(); // Loopback IPv6
+    expect($validate('2a01:e0a:21d:8230::/64'))->toBeTrue(); // IPv6 /64 CIDR
+    expect($validate('2001:db8::/48'))->toBeTrue(); // IPv6 /48 CIDR
+    expect($validate('2001:db8::1/128'))->toBeTrue(); // IPv6 /128 CIDR
+    expect($validate('192.168.1.1,2a01:e0a:21d:8230::/64'))->toBeTrue(); // Mixed IPv4 + IPv6 CIDR
 
     // Invalid cases - should fail
     expect($validate('1'))->toBeFalse(); // Single digit
@@ -155,6 +244,7 @@
     expect($validate('not.an.ip.address'))->toBeFalse(); // Invalid format
     expect($validate('192.168'))->toBeFalse(); // Incomplete IP
     expect($validate('192.168.1.1.1'))->toBeFalse(); // Too many octets
+    expect($validate('2001:db8::/129'))->toBeFalse(); // IPv6 mask > 128
 });
 
 test('ValidIpOrCidr validation rule error messages', function () {
@@ -181,3 +271,111 @@
     expect($error)->toContain('10.0.0.256');
     expect($error)->not->toContain('192.168.1.1'); // Valid IP should not be in error
 });
+
+test('deduplicateAllowlist removes bare IPv4 covered by various subnets', function () {
+    // /24
+    expect(deduplicateAllowlist(['192.168.1.5', '192.168.1.0/24']))->toBe(['192.168.1.0/24']);
+    // /16
+    expect(deduplicateAllowlist(['172.16.5.10', '172.16.0.0/16']))->toBe(['172.16.0.0/16']);
+    // /8
+    expect(deduplicateAllowlist(['10.50.100.200', '10.0.0.0/8']))->toBe(['10.0.0.0/8']);
+    // /32 — same host, first entry wins (both equivalent)
+    expect(deduplicateAllowlist(['192.168.1.1', '192.168.1.1/32']))->toBe(['192.168.1.1']);
+    // /31 — point-to-point
+    expect(deduplicateAllowlist(['192.168.1.0', '192.168.1.0/31']))->toBe(['192.168.1.0/31']);
+    // IP outside subnet — both preserved
+    expect(deduplicateAllowlist(['172.17.0.1', '172.16.0.0/16']))->toBe(['172.17.0.1', '172.16.0.0/16']);
+});
+
+test('deduplicateAllowlist removes narrow IPv4 CIDR covered by broader CIDR', function () {
+    // /32 inside /24
+    expect(deduplicateAllowlist(['192.168.1.1/32', '192.168.1.0/24']))->toBe(['192.168.1.0/24']);
+    // /25 inside /24
+    expect(deduplicateAllowlist(['192.168.1.0/25', '192.168.1.0/24']))->toBe(['192.168.1.0/24']);
+    // /24 inside /16
+    expect(deduplicateAllowlist(['192.168.1.0/24', '192.168.0.0/16']))->toBe(['192.168.0.0/16']);
+    // /16 inside /12
+    expect(deduplicateAllowlist(['172.16.0.0/16', '172.16.0.0/12']))->toBe(['172.16.0.0/12']);
+    // /16 inside /8
+    expect(deduplicateAllowlist(['10.1.0.0/16', '10.0.0.0/8']))->toBe(['10.0.0.0/8']);
+    // /24 inside /8
+    expect(deduplicateAllowlist(['10.1.2.0/24', '10.0.0.0/8']))->toBe(['10.0.0.0/8']);
+    // /12 inside /8
+    expect(deduplicateAllowlist(['172.16.0.0/12', '172.0.0.0/8']))->toBe(['172.0.0.0/8']);
+    // /31 inside /24
+    expect(deduplicateAllowlist(['192.168.1.0/31', '192.168.1.0/24']))->toBe(['192.168.1.0/24']);
+    // Non-overlapping CIDRs — both preserved
+    expect(deduplicateAllowlist(['192.168.1.0/24', '10.0.0.0/8']))->toBe(['192.168.1.0/24', '10.0.0.0/8']);
+    expect(deduplicateAllowlist(['172.16.0.0/16', '192.168.0.0/16']))->toBe(['172.16.0.0/16', '192.168.0.0/16']);
+});
+
+test('deduplicateAllowlist removes bare IPv6 covered by various prefixes', function () {
+    // /64 — issue #8729 exact scenario
+    expect(deduplicateAllowlist(['2a01:e0a:21d:8230::', '127.0.0.1', '2a01:e0a:21d:8230::/64']))
+        ->toBe(['127.0.0.1', '2a01:e0a:21d:8230::/64']);
+    // /48
+    expect(deduplicateAllowlist(['2001:db8:1234::1', '2001:db8:1234::/48']))->toBe(['2001:db8:1234::/48']);
+    // /128 — same host, first entry wins (both equivalent)
+    expect(deduplicateAllowlist(['2001:db8::1', '2001:db8::1/128']))->toBe(['2001:db8::1']);
+    // IP outside prefix — both preserved
+    expect(deduplicateAllowlist(['2001:db8:1235::1', '2001:db8:1234::/48']))
+        ->toBe(['2001:db8:1235::1', '2001:db8:1234::/48']);
+});
+
+test('deduplicateAllowlist removes narrow IPv6 CIDR covered by broader prefix', function () {
+    // /128 inside /64
+    expect(deduplicateAllowlist(['2a01:e0a:21d:8230::5/128', '2a01:e0a:21d:8230::/64']))->toBe(['2a01:e0a:21d:8230::/64']);
+    // /127 inside /64
+    expect(deduplicateAllowlist(['2001:db8:1234:5678::/127', '2001:db8:1234:5678::/64']))->toBe(['2001:db8:1234:5678::/64']);
+    // /64 inside /48
+    expect(deduplicateAllowlist(['2001:db8:1234:5678::/64', '2001:db8:1234::/48']))->toBe(['2001:db8:1234::/48']);
+    // /48 inside /32
+    expect(deduplicateAllowlist(['2001:db8:abcd::/48', '2001:db8::/32']))->toBe(['2001:db8::/32']);
+    // /32 inside /16
+    expect(deduplicateAllowlist(['2001:db8::/32', '2001::/16']))->toBe(['2001::/16']);
+    // /64 inside /32
+    expect(deduplicateAllowlist(['2001:db8:1234:5678::/64', '2001:db8::/32']))->toBe(['2001:db8::/32']);
+    // Non-overlapping IPv6 — both preserved
+    expect(deduplicateAllowlist(['2001:db8::/32', 'fd00::/8']))->toBe(['2001:db8::/32', 'fd00::/8']);
+    expect(deduplicateAllowlist(['2001:db8:1234::/48', '2001:db8:5678::/48']))->toBe(['2001:db8:1234::/48', '2001:db8:5678::/48']);
+});
+
+test('deduplicateAllowlist mixed IPv4 and IPv6 subnets', function () {
+    $result = deduplicateAllowlist([
+        '192.168.1.5',           // covered by 192.168.0.0/16
+        '192.168.0.0/16',
+        '2a01:e0a:21d:8230::1',  // covered by ::/64
+        '2a01:e0a:21d:8230::/64',
+        '10.0.0.1',              // not covered by anything
+        '::1',                   // not covered by anything
+    ]);
+    expect($result)->toBe(['192.168.0.0/16', '2a01:e0a:21d:8230::/64', '10.0.0.1', '::1']);
+});
+
+test('deduplicateAllowlist preserves non-overlapping entries', function () {
+    $result = deduplicateAllowlist(['192.168.1.1', '10.0.0.1', '172.16.0.0/16']);
+    expect($result)->toBe(['192.168.1.1', '10.0.0.1', '172.16.0.0/16']);
+});
+
+test('deduplicateAllowlist handles exact duplicates', function () {
+    expect(deduplicateAllowlist(['192.168.1.1', '192.168.1.1']))->toBe(['192.168.1.1']);
+    expect(deduplicateAllowlist(['10.0.0.0/8', '10.0.0.0/8']))->toBe(['10.0.0.0/8']);
+    expect(deduplicateAllowlist(['2001:db8::1', '2001:db8::1']))->toBe(['2001:db8::1']);
+});
+
+test('deduplicateAllowlist handles single entry and empty array', function () {
+    expect(deduplicateAllowlist(['10.0.0.1']))->toBe(['10.0.0.1']);
+    expect(deduplicateAllowlist([]))->toBe([]);
+});
+
+test('deduplicateAllowlist with 0.0.0.0 removes everything else', function () {
+    $result = deduplicateAllowlist(['192.168.1.1', '0.0.0.0', '10.0.0.0/8']);
+    expect($result)->toBe(['0.0.0.0']);
+});
+
+test('deduplicateAllowlist multiple nested CIDRs keeps only broadest', function () {
+    // IPv4: three levels of nesting
+    expect(deduplicateAllowlist(['10.1.2.0/24', '10.1.0.0/16', '10.0.0.0/8']))->toBe(['10.0.0.0/8']);
+    // IPv6: three levels of nesting
+    expect(deduplicateAllowlist(['2001:db8:1234:5678::/64', '2001:db8:1234::/48', '2001:db8::/32']))->toBe(['2001:db8::/32']);
+});