Autonomous system
AS43561 NET1-AS
Unclassified RIPE
Summary
Vivacom Bulgaria EAD
telecom residential mobile isp
NET1-AS is operated by Vivacom Bulgaria EAD.
What it's used for
- The address space carries residential and business broadband traffic, evidenced by reverse DNS entries such as
ip.btc-net.bgandhosting.net1.bg. - The AS announces 768 IPv4 addresses across 3 prefixes and 1 IPv6 prefix, with 11 observed neighbours, indicating a role as an access network for end-users.
- Traffic from this AS consists of subscriber eyeballs for mobile, fixed broadband, and TV services, reflecting Vivacom's status as a major Bulgarian telecommunications provider.
Notable
- Registrants for all announced prefixes are listed as "BTC IP ADDRESS SPACE administration; Vivacom Bulgaria EAD", aligning with the current operator.
- Vivacom Bulgaria EAD was formerly known as Bulgarian Telecommunications Company EAD (BTC), which explains the legacy
btc-net.bgdomain names in the reverse DNS records. - The inventory is compact, consisting of three /24 IPv4 blocks and a single /32 IPv6 block, typical for a focused access network rather than a large transit provider.
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 2 exchanges in 2 countries, largest first.
| Exchange | Location | Their address |
|---|---|---|
| DE-CIX Frankfurt | Frankfurt, Germany | 2001:7f8::aa29:0:1 |
| NetIX | Sofia, Bulgaria | 2001:67c:29f0::4:3561:2 |
Transit providers
1 upstream, 9 downstream and 11 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS8866 | Vivacom Bulgaria EAD | 221 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-11, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 3 prefixes · 768 addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| BG | Bulgaria | 4 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS43561- Registry name
- NET1-AS
- Registrant
- BT95-ADM
- Abuse contact
- abuse-ip@vivacom.bg
- Registered
- 2007-08-23
- Last changed
- 2022-12-05
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 100% valid · 4 valid, 0 with no ROA
- ROAs
- 17 authorising AS43561
- ASPA
- no ASPA record
- IRR
- 100% registered · 4 of 4 announcements
- Route objects
- 191 naming AS43561
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: 431 networks and 1,768 prefixes, as published 2026-10-12. 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