diff --git a/src/form/__tests__/validation.test.js b/src/form/__tests__/validation.test.js
index 94de278..ac42e29 100644
--- a/src/form/__tests__/validation.test.js
+++ b/src/form/__tests__/validation.test.js
@@ -1,16 +1,17 @@
 /*
- * Copyright (C) 2019 CZ.NIC z.s.p.o. (http://www.nic.cz/)
+ * Copyright (C) 2019-2022 CZ.NIC z.s.p.o. (https://www.nic.cz/)
  *
  * This is free software, licensed under the GNU General Public License v3.
  * See /LICENSE for more information.
  */
 
 import {
-    validateDomain,
-    validateDUID,
     validateIPv4Address,
     validateIPv6Address,
     validateIPv6Prefix,
+    validateDomain,
+    validateHostname,
+    validateDUID,
     validateMAC,
 } from "utils/validations";
 
@@ -68,6 +69,15 @@ describe("Validation functions", () => {
         expect(validateDomain(".")).not.toBe(undefined);
     });
 
+    it("validateHostname valid", () => {
+        expect(validateHostname("new-android")).toBe(undefined);
+        expect(validateHostname("local")).toBe(undefined);
+    });
+    it("validateHostname invalid", () => {
+        expect(validateHostname("-android")).not.toBe(undefined);
+        expect(validateHostname("local.")).not.toBe(undefined);
+    });
+
     it("validateDUID valid", () => {
         expect(validateDUID("abcdefAB")).toBe(undefined);
         expect(validateDUID("ABCDEF12")).toBe(undefined);
diff --git a/src/index.js b/src/index.js
index 2abb36e..ee7edad 100644
--- a/src/index.js
+++ b/src/index.js
@@ -82,6 +82,7 @@ export {
     validateIPv6Address,
     validateIPv6Prefix,
     validateDomain,
+    validateHostname,
     validateDUID,
     validateMAC,
     validateMultipleEmails,
diff --git a/src/utils/validations.js b/src/utils/validations.js
index 12671df..fb358a4 100644
--- a/src/utils/validations.js
+++ b/src/utils/validations.js
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2019 CZ.NIC z.s.p.o. (http://www.nic.cz/)
+ * Copyright (C) 2019-2022 CZ.NIC z.s.p.o. (https://www.nic.cz/)
  *
  * This is free software, licensed under the GNU General Public License v3.
  * See /LICENSE for more information.
@@ -14,6 +14,7 @@ export const ERROR_MESSAGES = {
     IPv6: _("This is not a valid IPv6 address."),
     IPv6Prefix: _("This is not a valid IPv6 prefix."),
     domain: _("This is not a valid domain name."),
+    hostname: _("This is not a valid hostname."),
     DUID: _("This is not a valid DUID."),
     MAC: _("This is not a valid MAC address."),
     MultipleEmails: _("Doesn't contain a list of emails separated by commas."),
@@ -23,7 +24,8 @@ const REs = {
     IPv4: /^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/,
     IPv6: /^(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))$/,
     IPv6Prefix: /^s*((([0-9A-Fa-f]{1,4}:){7}([0-9A-Fa-f]{1,4}|:))|(([0-9A-Fa-f]{1,4}:){6}(:[0-9A-Fa-f]{1,4}|((25[0-5]|2[0-4]d|1dd|[1-9]?d)(.(25[0-5]|2[0-4]d|1dd|[1-9]?d)){3})|:))|(([0-9A-Fa-f]{1,4}:){5}(((:[0-9A-Fa-f]{1,4}){1,2})|:((25[0-5]|2[0-4]d|1dd|[1-9]?d)(.(25[0-5]|2[0-4]d|1dd|[1-9]?d)){3})|:))|(([0-9A-Fa-f]{1,4}:){4}(((:[0-9A-Fa-f]{1,4}){1,3})|((:[0-9A-Fa-f]{1,4})?:((25[0-5]|2[0-4]d|1dd|[1-9]?d)(.(25[0-5]|2[0-4]d|1dd|[1-9]?d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){3}(((:[0-9A-Fa-f]{1,4}){1,4})|((:[0-9A-Fa-f]{1,4}){0,2}:((25[0-5]|2[0-4]d|1dd|[1-9]?d)(.(25[0-5]|2[0-4]d|1dd|[1-9]?d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){2}(((:[0-9A-Fa-f]{1,4}){1,5})|((:[0-9A-Fa-f]{1,4}){0,3}:((25[0-5]|2[0-4]d|1dd|[1-9]?d)(.(25[0-5]|2[0-4]d|1dd|[1-9]?d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){1}(((:[0-9A-Fa-f]{1,4}){1,6})|((:[0-9A-Fa-f]{1,4}){0,4}:((25[0-5]|2[0-4]d|1dd|[1-9]?d)(.(25[0-5]|2[0-4]d|1dd|[1-9]?d)){3}))|:))|(:(((:[0-9A-Fa-f]{1,4}){1,7})|((:[0-9A-Fa-f]{1,4}){0,5}:((25[0-5]|2[0-4]d|1dd|[1-9]?d)(.(25[0-5]|2[0-4]d|1dd|[1-9]?d)){3}))|:)))(%.+)?s*(\/([0-9]|[1-9][0-9]|1[0-1][0-9]|12[0-8]))$/,
-    domain: /^[A-Za-z0-9][A-Za-z0-9.-]{1,255}$/,
+    domain: /^([a-z0-9]+(-[a-z0-9]+)*\.)+[a-z]{2,}$/,
+    hostname: /^[a-z\d]([a-z\d-]{0,61}[a-z\d])?(\.[a-z\d]([a-z\d-]{0,61}[a-z\d])?)*$/i,
     DUID: /^([0-9a-fA-F]{2}){4}([0-9a-fA-F]{2})*$/,
     MAC: /^([a-fA-F0-9]{2}:){5}[a-fA-F0-9]{2}$/,
     MultipleEmails: /^([a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+ *)( *, *[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+ *)*$/,
@@ -40,6 +42,7 @@ const validateIPv4Address = createValidator("IPv4");
 const validateIPv6Address = createValidator("IPv6");
 const validateIPv6Prefix = createValidator("IPv6Prefix");
 const validateDomain = createValidator("domain");
+const validateHostname = createValidator("hostname");
 const validateDUID = createValidator("DUID");
 const validateMAC = createValidator("MAC");
 const validateMultipleEmails = createValidator("MultipleEmails");
@@ -49,6 +52,7 @@ export {
     validateIPv6Address,
     validateIPv6Prefix,
     validateDomain,
+    validateHostname,
     validateDUID,
     validateMAC,
     validateMultipleEmails,