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ipv4

Validate that a string is a valid IPv4 address (four 0-255 octets, dotted notation).

Signature​

NguardValidators.String.ipv4: ValidatorFn

A parameterless validator — used directly without invocation.

Reactive forms​

import { FormControl } from '@angular/forms';
import { NguardValidators } from 'ng-nguard';

const address = new FormControl('', [NguardValidators.String.ipv4]);

Template-driven forms​

<input ngModel name="address" nguardIpv4 />

Error key​

{ ipv4: true }

Notes​

  • Pattern: ^((25[0-5]|2[0-4]\d|[01]?\d\d?)\.){3}(25[0-5]|2[0-4]\d|[01]?\d\d?)$.
  • Accepts canonical octets only — 0.0.0.0 and 255.255.255.255 are valid; 999.0.0.1 and 192.168.1 are not.
  • IPv6 addresses fail.
  • Empty strings fail.

See also​

  • ip — accepts IPv4 or IPv6
  • ipv6 — IPv6-only check