AS5421
Sofia University St. Kliment Ohridski
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
- Academic allocation +6
- Trust score 71 / 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 |
|---|---|---|---|---|---|---|
| 62.44.96.0/19 | 8.2K |
24.7%
|
Sofia University St. Kliment Ohridski | BG | Sofia-Capital | Sofia |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS5421 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 |
|---|---|---|
| 62.44.120.0/22 | 85,967 | 2026-07-23 22:24:56 |
| 62.44.124.0/23 | 85,918 | 2026-07-23 22:24:56 |
| 62.44.96.0/19 | 27,023 | 2026-07-23 22:25:19 |
Frequently Asked Questions
What is AS5421?
AS5421 is an Autonomous System Number assigned to Sofia University St. Kliment Ohridski. 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 AS5421 announce?
AS5421 announces 8.2K IPv4 addresses distributed across 1 routed CIDR prefixes. The network is registered in Bulgaria.
Who operates AS5421?
AS5421 is operated by Sofia University St. Kliment Ohridski. The organization is based in Bulgaria. You can view all IP ranges and related ASNs on the organization page.
What country is AS5421 registered in?
AS5421 is registered in Bulgaria. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
