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
- Enterprise allocation +4
- Trust score 69 / 100
Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 151.251.64.0/23 | 512 |
0.0%
|
A1 Bulgaria EAD | BG | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS42157 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 |
|---|---|---|
| 151.251.64.0/23 | 9,667 | 2026-07-26 07:04:57 |
Frequently Asked Questions
What is AS42157?
AS42157 is an Autonomous System Number assigned to A1 Bulgaria EAD. 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 AS42157 announce?
AS42157 announces 512 IPv4 addresses distributed across 1 routed CIDR prefixes. The network is registered in Bulgaria.
Who operates AS42157?
AS42157 is operated by A1 Bulgaria EAD. The organization is based in Bulgaria. You can view all IP ranges and related ASNs on the organization page.
What country is AS42157 registered in?
AS42157 is registered in Bulgaria. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
