All-in-one IPv4 / IPv6 Address Lookup

AS45753 (Netsec Limited) manages the 112.121.172.0/22 prefix block (approximately 1024 addresses) in the Other category. AS45753 independently controls its routing policy, peering relationships and IP allocation — Netsec Limited is directly responsible for traffic to and from addresses in the 112.121.172.0/22 block. The IP 112.121.173.84 resides in China Hong Kong (timezone Asia/Hong_Kong); 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.

Spamhaus has listed this IP (SBL: 垃圾邮件 / 恶意来源), which suggests it has been involved in spam or compromised activity. While a listing does not guarantee ongoing abuse, it can impact deliverability and trust score. Balance risk-control with normal access patterns: standard rate limiting plus CAPTCHA on sensitive flows.

Recommendation: insufficient data to classify 112.121.173.84 — 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.