All-in-one IPv4 / IPv6 Address Lookup

AS174（Cogent Communications, LLC） (Cpuonsite) manages the 38.137.168.0/21 prefix block (approximately 2048 addresses) in the Other category. AS174 independently controls its routing policy, peering relationships and IP allocation — Cpuonsite is directly responsible for traffic to and from addresses in the 38.137.168.0/21 block. The IP 38.137.170.181 resides in United States Texas Valladolid (timezone Europe/Madrid); 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 Unknown category indicates this IP is part of normal Other 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 38.137.170.181 — 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.