121.166.5.77
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
- Long-established allocation (20y) +6
- Not on any threat blocklist +5
- Trust score 76 / 100
Experimental · trust-vectors model v1.1.0 — a transparent heuristic, not a definitive verdict. How it works →
Network Allocation for 121.166.5.77
- CIDR range
- 121.166.0.0/20
- IP range (int)
- 2,040,922,112 — 2,040,926,207
- Prefix length
- /20
- Organization
- Korea Telecom
- ASN
- AS4766
- ASN name
- Korea Telecom
- Location
- Yongin-si, Gyeonggi Do, South Korea
- Coordinates
- 37.329300, 127.055700
- Accuracy radius
- 10 km
- Postal code
- 168
- Regional Internet Registry
- APNIC
- Allocated
- 2006-11-01
- Data source(s)
- maxmind_city, maxmind_asn, ipinfo_lite, maxmind_country
- Last updated
- 2026-07-11 09:23:09
BGP Routing
Live BGP anomalies →Origin AS announcing the most-specific prefix that covers this IP, observed across our RIPE RIS collectors.
RIR Ownership History
Atom feed ⇲Allocation changes captured weekly from regional internet registry (RIR) delegation files for ranges that have contained this IP.
| Date | Event | From | To |
|---|---|---|---|
| 2026-05-10 | New Allocation | — | KR |
See the full history for 121.128.0.0/10.
Frequently Asked Questions
Who owns 121.166.5.77?
121.166.5.77 is allocated to Korea Telecom (AS4766), registered in Yongin-si, South Korea.
Where is 121.166.5.77 located?
The geolocation for 121.166.5.77 maps to Yongin-si, South Korea 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 121.166.5.77 on?
121.166.5.77 belongs to the 121.166.0.0/20 network block announced by AS4766. This range contains 4,096 addresses.
Does 121.166.5.77 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.
