An annotation class for validating IPv4 addresses with Hibernate Validator.

Ipv4.java

package hibernatevalidator.constraints;

import javax.validation.Constraint;
import javax.validation.Payload;
import javax.validation.ReportAsSingleViolation;
import javax.validation.constraints.Pattern;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import static java.lang.annotation.ElementType.*;
import static java.lang.annotation.RetentionPolicy.*;

@Pattern(regexp = "^([0-1]?\\d?\\d|2[0-4]\\d|25[0-5])(\\.([0-1]?\\d?\\d|2[0-4]\\d|25[0-5])){3}$")
@Target({METHOD, FIELD, ANNOTATION_TYPE})
@Retention(RUNTIME)
@Constraint(validatedBy = {})
@Documented
@ReportAsSingleViolation
public @interface Ipv4 {
  String message() default "must be ipv4";

  Class<?>[] groups() default {};

  Class<? extends Payload>[] payload() default {};
}