Reputation · trust score
A transparent 0–100 signal. Every entity starts at a neutral baseline of 65; threat-intel blocklists, exposure, reverse-DNS, routing and allocation each adjust it up or down. Higher is more trustworthy.
- Baseline (neutral) 65
- Active-threat / abuse risk −35
- Long-established allocation (15y) +6
- Has a reverse-DNS (PTR) record +5
- Trust score 41 / 100
Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →
DNS records
- Reverse DNS (PTR)
- adhddknwp.thefirstreef.com
- Forward-confirmed (FCrDNS)
- ✗ Mismatch
- PTR TTL
- 3600 s
- Reverse DNS last checked
- 2026-07-26 23:31 UTC
- Forward DNS last checked
- 2026-07-26 23:31 UTC
Reverse & forward DNS collected by the WorldIP scanner fleet — FCrDNS confirms the PTR hostname resolves back to this IP.
Network Allocation for 221.128.132.51
- CIDR range
- 221.128.132.0/22
- IP range (int)
- 3,716,187,136 — 3,716,188,159
- Prefix length
- /22
- Location
- China
- Coordinates
- 34.773200, 113.722000
- Accuracy radius
- 1000 km
- Regional Internet Registry
- APNIC
- Allocated
- 2011-04-12
- Data source(s)
- ipinfo_lite, maxmind_city, maxmind_country
- Last updated
- 2026-07-18 18:06:17
Frequently Asked Questions
Who owns 221.128.132.51?
221.128.132.51 is allocated to an unknown organization, registered in China.
Where is 221.128.132.51 located?
The geolocation for 221.128.132.51 maps to China based on MaxMind GeoLite2 data. Accuracy depends on the provider and may represent the ISP's regional hub rather than the exact endpoint.
What network is 221.128.132.51 on?
221.128.132.51 belongs to the 221.128.132.0/22 network block. This range contains 1,024 addresses.
Does 221.128.132.51 have a reverse DNS record?
Reverse DNS (PTR) records are resolved live when you visit this page. If a PTR record exists, it appears in the Reverse DNS field above. PTR records map IP addresses back to hostnames and are commonly used for email authentication and network diagnostics.
Neighbors
Other addresses in the same /24.
