diff --git a/lib/internal/net.js b/lib/internal/net.js
index 78e155e055a820..d2b097573b918e 100644
--- a/lib/internal/net.js
+++ b/lib/internal/net.js
@@ -1,15 +1,33 @@
 'use strict';
 
 const Buffer = require('buffer').Buffer;
-const { isIPv6 } = process.binding('cares_wrap');
 const { writeBuffer } = process.binding('fs');
 const errors = require('internal/errors');
 
-const octet = '(?:[0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])';
-const re = new RegExp(`^${octet}[.]${octet}[.]${octet}[.]${octet}$`);
+// IPv4 Segment
+const v4Seg = '(?:[0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])';
+const v4Str = `(${v4Seg}[.]){3}${v4Seg}`;
+const IPv4Reg = new RegExp(`^${v4Str}$`);
+
+// IPv6 Segment
+const v6Seg = '(?:[0-9a-fA-F]{1,4})';
+const IPv6Reg = new RegExp('^(' +
+  `(?:${v6Seg}:){7}(?:${v6Seg}|:)|` +
+  `(?:${v6Seg}:){6}(?:${v4Str}|:${v6Seg}|:)|` +
+  `(?:${v6Seg}:){5}(?::${v4Str}|(:${v6Seg}){1,2}|:)|` +
+  `(?:${v6Seg}:){4}(?:(:${v6Seg}){0,1}:${v4Str}|(:${v6Seg}){1,3}|:)|` +
+  `(?:${v6Seg}:){3}(?:(:${v6Seg}){0,2}:${v4Str}|(:${v6Seg}){1,4}|:)|` +
+  `(?:${v6Seg}:){2}(?:(:${v6Seg}){0,3}:${v4Str}|(:${v6Seg}){1,5}|:)|` +
+  `(?:${v6Seg}:){1}(?:(:${v6Seg}){0,4}:${v4Str}|(:${v6Seg}){1,6}|:)|` +
+  `(?::((?::${v6Seg}){0,5}:${v4Str}|(?::${v6Seg}){1,7}|:))` +
+')(%[0-9a-zA-Z]{1,})?$');
 
 function isIPv4(s) {
-  return re.test(s);
+  return IPv4Reg.test(s);
+}
+
+function isIPv6(s) {
+  return IPv6Reg.test(s);
 }
 
 function isIP(s) {
diff --git a/src/cares_wrap.cc b/src/cares_wrap.cc
index 8fea040f329c41..a3de844d7ec97e 100644
--- a/src/cares_wrap.cc
+++ b/src/cares_wrap.cc
@@ -1955,11 +1955,6 @@ int ParseIP(const char* ip, ParseIPResult* result = nullptr) {
   return 0;
 }
 
-void IsIPv6(const FunctionCallbackInfo<Value>& args) {
-  node::Utf8Value ip(args.GetIsolate(), args[0]);
-  args.GetReturnValue().Set(6 == ParseIP(*ip));
-}
-
 void CanonicalizeIP(const FunctionCallbackInfo<Value>& args) {
   v8::Isolate* isolate = args.GetIsolate();
   node::Utf8Value ip(isolate, args[0]);
@@ -2208,7 +2203,6 @@ void Initialize(Local<Object> target,
 
   env->SetMethod(target, "getaddrinfo", GetAddrInfo);
   env->SetMethod(target, "getnameinfo", GetNameInfo);
-  env->SetMethodNoSideEffect(target, "isIPv6", IsIPv6);
   env->SetMethodNoSideEffect(target, "canonicalizeIP", CanonicalizeIP);
 
   env->SetMethod(target, "strerror", StrError);
diff --git a/test/parallel/test-net-isipv4.js b/test/parallel/test-net-isipv4.js
new file mode 100644
index 00000000000000..ec04505cedb27f
--- /dev/null
+++ b/test/parallel/test-net-isipv4.js
@@ -0,0 +1,46 @@
+'use strict';
+require('../common');
+const assert = require('assert');
+const net = require('net');
+
+const v4 = [
+  '0.0.0.0',
+  '8.8.8.8',
+  '127.0.0.1',
+  '100.100.100.100',
+  '192.168.0.1',
+  '18.101.25.153',
+  '123.23.34.2',
+  '172.26.168.134',
+  '212.58.241.131',
+  '128.0.0.0',
+  '23.71.254.72',
+  '223.255.255.255',
+  '192.0.2.235',
+  '99.198.122.146',
+  '46.51.197.88',
+  '173.194.34.134'
+];
+
+const v4not = [
+  '.100.100.100.100',
+  '100..100.100.100.',
+  '100.100.100.100.',
+  '999.999.999.999',
+  '256.256.256.256',
+  '256.100.100.100.100',
+  '123.123.123',
+  'http://123.123.123',
+  '1000.2.3.4',
+  '999.2.3.4',
+  '0000000192.168.0.200',
+  '192.168.0.2000000000'
+];
+
+v4.forEach((ip) => {
+  assert.strictEqual(net.isIPv4(ip), true);
+});
+
+v4not.forEach((ip) => {
+  assert.strictEqual(net.isIPv4(ip), false);
+});
diff --git a/test/parallel/test-net-isipv6.js b/test/parallel/test-net-isipv6.js
new file mode 100644
index 00000000000000..7ba379c3bdd27e
--- /dev/null
+++ b/test/parallel/test-net-isipv6.js
@@ -0,0 +1,244 @@
+'use strict';
+require('../common');
+const assert = require('assert');
+const net = require('net');
+
+const v6 = [
+  '::',
+  '1::',
+  '::1',
+  '1::8',
+  '1::7:8',
+  '1:2:3:4:5:6:7:8',
+  '1:2:3:4:5:6::8',
+  '1:2:3:4:5:6:7::',
+  '1:2:3:4:5::7:8',
+  '1:2:3:4:5::8',
+  '1:2:3::8',
+  '1::4:5:6:7:8',
+  '1::6:7:8',
+  '1::3:4:5:6:7:8',
+  '1:2:3:4::6:7:8',
+  '1:2::4:5:6:7:8',
+  '::2:3:4:5:6:7:8',
+  '1:2::8',
+  '2001:0000:1234:0000:0000:C1C0:ABCD:0876',
+  '3ffe:0b00:0000:0000:0001:0000:0000:000a',
+  'FF02:0000:0000:0000:0000:0000:0000:0001',
+  '0000:0000:0000:0000:0000:0000:0000:0001',
+  '0000:0000:0000:0000:0000:0000:0000:0000',
+  '::ffff:192.168.1.26',
+  '2::10',
+  'ff02::1',
+  'fe80::',
+  '2002::',
+  '2001:db8::',
+  '2001:0db8:1234::',
+  '::ffff:0:0',
+  '::ffff:192.168.1.1',
+  '1:2:3:4::8',
+  '1::2:3:4:5:6:7',
+  '1::2:3:4:5:6',
+  '1::2:3:4:5',
+  '1::2:3:4',
+  '1::2:3',
+  '::2:3:4:5:6:7',
+  '::2:3:4:5:6',
+  '::2:3:4:5',
+  '::2:3:4',
+  '::2:3',
+  '::8',
+  '1:2:3:4:5:6::',
+  '1:2:3:4:5::',
+  '1:2:3:4::',
+  '1:2:3::',
+  '1:2::',
+  '1:2:3:4::7:8',
+  '1:2:3::7:8',
+  '1:2::7:8',
+  '1:2:3:4:5:6:1.2.3.4',
+  '1:2:3:4:5::1.2.3.4',
+  '1:2:3:4::1.2.3.4',
+  '1:2:3::1.2.3.4',
+  '1:2::1.2.3.4',
+  '1::1.2.3.4',
+  '1:2:3:4::5:1.2.3.4',
+  '1:2:3::5:1.2.3.4',
+  '1:2::5:1.2.3.4',
+  '1::5:1.2.3.4',
+  '1::5:11.22.33.44',
+  'fe80::217:f2ff:254.7.237.98',
+  'fe80::217:f2ff:fe07:ed62',
+  '2001:DB8:0:0:8:800:200C:417A',
+  'FF01:0:0:0:0:0:0:101',
+  '0:0:0:0:0:0:0:1',
+  '0:0:0:0:0:0:0:0',
+  '2001:DB8::8:800:200C:417A',
+  'FF01::101',
+  '0:0:0:0:0:0:13.1.68.3',
+  '0:0:0:0:0:FFFF:129.144.52.38',
+  '::13.1.68.3',
+  '::FFFF:129.144.52.38',
+  'fe80:0000:0000:0000:0204:61ff:fe9d:f156',
+  'fe80:0:0:0:204:61ff:fe9d:f156',
+  'fe80::204:61ff:fe9d:f156',
+  'fe80:0:0:0:204:61ff:254.157.241.86',
+  'fe80::204:61ff:254.157.241.86',
+  'fe80::1',
+  '2001:0db8:85a3:0000:0000:8a2e:0370:7334',
+  '2001:db8:85a3:0:0:8a2e:370:7334',
+  '2001:db8:85a3::8a2e:370:7334',
+  '2001:0db8:0000:0000:0000:0000:1428:57ab',
+  '2001:0db8:0000:0000:0000::1428:57ab',
+  '2001:0db8:0:0:0:0:1428:57ab',
+  '2001:0db8:0:0::1428:57ab',
+  '2001:0db8::1428:57ab',
+  '2001:db8::1428:57ab',
+  '::ffff:12.34.56.78',
+  '::ffff:0c22:384e',
+  '2001:0db8:1234:0000:0000:0000:0000:0000',
+  '2001:0db8:1234:ffff:ffff:ffff:ffff:ffff',
+  '2001:db8:a::123',
+  '::ffff:192.0.2.128',
+  '::ffff:c000:280',
+  'a:b:c:d:e:f:f1:f2',
+  'a:b:c::d:e:f:f1',
+  'a:b:c::d:e:f',
+  'a:b:c::d:e',
+  'a:b:c::d',
+  '::a',
+  '::a:b:c',
+  '::a:b:c:d:e:f:f1',
+  'a::',
+  'a:b:c::',
+  'a:b:c:d:e:f:f1::',
+  'a:bb:ccc:dddd:000e:00f:0f::',
+  '0:a:0:a:0:0:0:a',
+  '0:a:0:0:a:0:0:a',
+  '2001:db8:1:1:1:1:0:0',
+  '2001:db8:1:1:1:0:0:0',
+  '2001:db8:1:1:0:0:0:0',
+  '2001:db8:1:0:0:0:0:0',
+  '2001:db8:0:0:0:0:0:0',
+  '2001:0:0:0:0:0:0:0',
+  'A:BB:CCC:DDDD:000E:00F:0F::',
+  '0:0:0:0:0:0:0:a',
+  '0:0:0:0:a:0:0:0',
+  '0:0:0:a:0:0:0:0',
+  'a:0:0:a:0:0:a:a',
+  'a:0:0:a:0:0:0:a',
+  'a:0:0:0:a:0:0:a',
+  'a:0:0:0:a:0:0:0',
+  'a:0:0:0:0:0:0:0',
+  'fe80::7:8%eth0',
+  'fe80::7:8%1'
+];
+
+const v6not = [
+  '',
+  '1:',
+  ':1',
+  '11:36:12',
+  '02001:0000:1234:0000:0000:C1C0:ABCD:0876',
+  '2001:0000:1234:0000:00001:C1C0:ABCD:0876',
+  '2001:0000:1234: 0000:0000:C1C0:ABCD:0876',
+  '2001:1:1:1:1:1:255Z255X255Y255',
+  '3ffe:0b00:0000:0001:0000:0000:000a',
+  'FF02:0000:0000:0000:0000:0000:0000:0000:0001',
+  '3ffe:b00::1::a',
+  '::1111:2222:3333:4444:5555:6666::',
+  '1:2:3::4:5::7:8',
+  '12345::6:7:8',
+  '1::5:400.2.3.4',
+  '1::5:260.2.3.4',
+  '1::5:256.2.3.4',
+  '1::5:1.256.3.4',
+  '1::5:1.2.256.4',
+  '1::5:1.2.3.256',
+  '1::5:300.2.3.4',
+  '1::5:1.300.3.4',
+  '1::5:1.2.300.4',
+  '1::5:1.2.3.300',
+  '1::5:900.2.3.4',
+  '1::5:1.900.3.4',
+  '1::5:1.2.900.4',
+  '1::5:1.2.3.900',
+  '1::5:300.300.300.300',
+  '1::5:3000.30.30.30',
+  '1::400.2.3.4',
+  '1::260.2.3.4',
+  '1::256.2.3.4',
+  '1::1.256.3.4',
+  '1::1.2.256.4',
+  '1::1.2.3.256',
+  '1::300.2.3.4',
+  '1::1.300.3.4',
+  '1::1.2.300.4',
+  '1::1.2.3.300',
+  '1::900.2.3.4',
+  '1::1.900.3.4',
+  '1::1.2.900.4',
+  '1::1.2.3.900',
+  '1::300.300.300.300',
+  '1::3000.30.30.30',
+  '::400.2.3.4',
+  '::260.2.3.4',
+  '::256.2.3.4',
+  '::1.256.3.4',
+  '::1.2.256.4',
+  '::1.2.3.256',
+  '::300.2.3.4',
+  '::1.300.3.4',
+  '::1.2.300.4',
+  '::1.2.3.300',
+  '::900.2.3.4',
+  '::1.900.3.4',
+  '::1.2.900.4',
+  '::1.2.3.900',
+  '::300.300.300.300',
+  '::3000.30.30.30',
+  '2001:DB8:0:0:8:800:200C:417A:221',
+  'FF01::101::2',
+  '1111:2222:3333:4444::5555:',
+  '1111:2222:3333::5555:',
+  '1111:2222::5555:',
+  '1111::5555:',
+  '::5555:',
+  ':::',
+  '1111:',
+  ':',
+  ':1111:2222:3333:4444::5555',
+  ':1111:2222:3333::5555',
+  ':1111:2222::5555',
+  ':1111::5555',
+  ':::5555',
+  '1.2.3.4:1111:2222:3333:4444::5555',
+  '1.2.3.4:1111:2222:3333::5555',
+  '1.2.3.4:1111:2222::5555',
+  '1.2.3.4:1111::5555',
+  '1.2.3.4::5555',
+  '1.2.3.4::',
+  'fe80:0000:0000:0000:0204:61ff:254.157.241.086',
+  '123',
+  'ldkfj',
+  '2001::FFD3::57ab',
+  '2001:db8:85a3::8a2e:37023:7334',
+  '2001:db8:85a3::8a2e:370k:7334',
+  '1:2:3:4:5:6:7:8:9',
+  '1::2::3',
+  '1:::3:4:5',
+  '1:2:3::4:5:6:7:8:9',
+  '::ffff:2.3.4',
+  '::ffff:257.1.2.3',
+  '::ffff:12345678901234567890.1.26',
+  '2001:0000:1234:0000:0000:C1C0:ABCD:0876 0',
+  '02001:0000:1234:0000:0000:C1C0:ABCD:0876'
+];
+
+v6.forEach((ip) => {
+  assert.strictEqual(net.isIPv6(ip), true);
+});
+
+v6not.forEach((ip) => {
+  assert.strictEqual(net.isIPv6(ip), false);
+});