Autonomous system
AS13124 A1BG_RSD A1 Bulgaria EAD
Unclassified RIPE Cable/DSL/ISP
Summary
A1 Bulgaria
telecom isp mobile
A hostname whose label is twelve hexadecimal digits, the shape of a hardware address.
What it's used for
- A Bulgarian mobile and fixed-line operator. 305,408 addresses across 190 IPv4 prefixes, 60 IPv6 prefixes, and one observed BGP neighbour.
Notable
- Seven of 18 sampled addresses returned names across three unrelated domains.
- One is
602ad0dafee2.softphone.blizoo.bg, a twelve-character hexadecimal label followed by a device type. - Two different addresses both returned
unknown.interbgc.com, the same name for both. - Netnames mix
BG-MTELNETdates from 2005 to 2012 withA1-NETandA1-CATV.
Interesting
- Twelve hex digits in a hostname is the format of a network interface's hardware address. Whatever generated that name took an identifier from the device itself and published it, which ties a public address to a specific piece of equipment for as long as the record stands.
- Two addresses sharing one reverse name is a zone with a wildcard or a default: the lookup succeeds and tells you nothing, which is worse than failing, because a name that answers looks like an answer.
- Two hundred and fifty announcements behind a single BGP neighbour is the most lopsided ratio in this range. Every one of those prefixes reaches the internet through one adjacency, so the fragmentation buys nothing in resilience.
- Three domains from three absorbed brands still answer for the space.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
Recorded at 1 exchange in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| DE-CIX Frankfurt | Frankfurt, Germany | 2001:7f8::3344:0:1 |
Transit providers
1 upstream, 0 downstream and 2 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS8717 | A1 Bulgaria EAD | 29,110 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-01, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 185 prefixes · 307K addresses IPv6 58 prefixes
| Country | Name | Prefixes |
|---|---|---|
| BG | Bulgaria | 243 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS13124- Registry name
- A1BG_RSD
- Registrant
- AS12716-MNT
- Abuse contact
- RIPE.Abuse@a1.bg
- Registered
- 1970-01-01
- Last changed
- 2026-04-10
- Allocation
- allocated
Declared
PeeringDB profile
- Name
- A1 Bulgaria AS13124
- Network type
- Cable/DSL/ISP
- Scope
- Regional
- Traffic ratio
- Balanced
- Peering policy
- Restrictive
- IRR as-set
RIPE::AS-IBGC- Website
- http://www.a1.bg
PeeringDB records are maintained by the network operator and are not independently verified. Treat them as a statement of intent rather than of fact. For the observed and recorded view, see peering, which lists the exchanges Packet Clearing House has a port on file for.
Routing security
RPKI and IRR
- RPKI
- 100% valid · 513 valid, 0 with no ROA
- ROAs
- 520 authorising AS13124
- ASPA
- no ASPA record
- IRR
- 100% registered · 513 of 513 announcements
- Route objects
- 518 naming AS13124
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 449 networks and 1,846 prefixes, as published 2026-11-02. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere