All-in-one IPv4 / IPv6 Address Lookup

AS6128 (Cablevision Systems Corp.) manages the 47.21.224.0/20 prefix block (approximately 4096 addresses) in the Other category. AS6128 independently controls its routing policy, peering relationships and IP allocation — Cablevision Systems Corp. is directly responsible for traffic to and from addresses in the 47.21.224.0/20 block. The IP 47.21.238.126 resides in United States New York Woodbury (timezone America/New_York); its position within this block determines routing behavior and connectivity characteristics.

The reverse DNS record resolves to ool-2f15ee7e.static.optonline.net, which may reflect a different service layer or hosting configuration. The mismatch between PTR and provider name may cause elevated scrutiny from mail servers and WAFs during reverse verification.

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 47.21.238.126 — 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.