All-in-one IPv4 / IPv6 Address Lookup

AS4134（Chinanet） (China Telecom) manages the 121.8.0.0/18 prefix block (approximately 16384 addresses) in the ISP Network category. China Telecom backbone (ChinaNet), one of the largest ISP backbones in China, spanning fixed broadband, IDC and CDN caching. The IP 121.8.63.64 resides in China Guangdong Guangzhou (timezone Asia/Shanghai); 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 121.8.63.64 — 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.