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
- Trust score 65 / 100
Experimental · trust-vectors model v1.1.0 — a transparent heuristic, not a definitive verdict. How it works →
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 203.239.96.0/22 | 1.0K |
0.1%
|
HMM | KR | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS131820 actually originates in BGP, observed across our RIPE RIS collectors. This live routing view can differ from the registry allocation above.
| Prefix | Announcement samples | Last seen |
|---|---|---|
| 203.239.96.0/22 | 8,151 | 2026-07-23 18:16:03 |
| 203.239.97.0/24 | 7,524 | 2026-07-23 18:36:13 |
| 203.239.99.0/24 | 6,515 | 2026-07-23 18:16:03 |
Frequently Asked Questions
What is AS131820?
AS131820 is an Autonomous System Number assigned to HMM. An ASN identifies a network that controls a specific set of IP addresses and determines how traffic is routed across the internet via BGP (Border Gateway Protocol).
How many IP addresses does AS131820 announce?
AS131820 announces 1.0K IPv4 addresses distributed across 1 routed CIDR prefixes. The network is registered in South Korea.
Who operates AS131820?
AS131820 is operated by HMM. The organization is based in South Korea. You can view all IP ranges and related ASNs on the organization page.
What country is AS131820 registered in?
AS131820 is registered in South Korea. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
