# The Online Safety (CSEA Content Reporting by Regulated User-to-User Service Providers) Regulations 2026, Paragraph 3


IP addresses must be formatted as follows—
(a) in the case of an IPv4 address, as four sets of numbers separated by dots, and
(b) in the case of an IPv6 address, as eight groups of four hexadecimal digits separated by colons.

---
Source: https://www.legislation.gov.uk/uksi/2026/268/schedule/2/paragraph/3 (the official version)
Page: https://openlegislation.uk/online-safety-csea-content-reporting-by-regulated-user-to-user-service-providers-regulations-2026/schedule-2/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.