All-in-one IPv4 / IPv6 Address Lookup

AS2856 (British Telecommunications Limited) manages the 81.135.144.0/20 prefix block (approximately 4096 addresses) in the ISP Network category. AS2856 independently controls its routing policy, peering relationships and IP allocation — British Telecommunications Limited is directly responsible for traffic to and from addresses in the 81.135.144.0/20 block. The IP 81.135.158.242 resides in United Kingdom Wales (timezone Europe/London); its position within this block determines routing behavior and connectivity characteristics.

No reverse DNS (PTR) record is configured, which is common for dynamically assigned or CGNAT'd addresses but limits reverse verification capability. PTR records are commonly used by mail servers and anti-spam systems to validate connecting IPs — their absence can affect deliverability to strict receivers.

Based on local classification and Spamhaus real-time reputation, no blacklist entries detected, no security risk flags detected. The Enterprise / dedicated line category indicates this IP is part of normal ISP Network infrastructure and carries low inherent risk. Balance risk-control with normal access patterns: standard rate limiting plus CAPTCHA on sensitive flows.

Recommendation: insufficient data to classify 81.135.158.242 — apply a balanced policy: standard rate limiting, CAPTCHA for sensitive operations, and monitor access logs for anomalies. Reassess as the IP's usage history accumulates in this site's archive.