AS43561 — NET1-AS Vivacom Bulgaria EAD

AS43561 announces 3 IPv4 prefixes covering 768 addresses and 1 IPv6 prefixes.

About this network

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.bg and hosting.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.bg domain 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.

Announced prefixes

• 37.157.191.0/24
• 95.87.209.0/24
• 95.87.255.0/24
• 2a02:1338::/32

Upstream networks

• AS8866 Vivacom Bulgaria EAD

Downstream networks

• AS39683 Netpoint Services Ltd.
• AS28820 Eastern Telecommunication Company EAD
• AS35011 Prosveta Sofia PLC
• AS200033 Megalan EOOD
• AS198202 PEB "Texim" JSC
• AS204469 Sanevian
• AS199132 CALDERRA Ltd.
• AS44564 Technical Solution Ltd
• AS196801 Chimimport Plc

Adjacent networks

• AS8866 Vivacom Bulgaria EAD
• AS39683 Netpoint Services Ltd.
• AS28820 Eastern Telecommunication Company EAD
• AS35011 Prosveta Sofia PLC
• AS200033 Megalan EOOD
• AS198202 PEB "Texim" JSC
• AS204469 Sanevian
• AS199132 CALDERRA Ltd.
• AS44564 Technical Solution Ltd
• AS196801 Chimimport Plc

Routing security

• RPKI: 4 valid, 0 invalid and 0 not-found announcements; 17 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 191 route objects.
• Listed in as-sets: AS-BALKAN-IX-V6, AS-BALKANIX, AS-BTC-UP, AS-BTELOUT, AS-EVRONET, AS-HURRICANEV6, AS-INTEROUTE, AS-ITDOUT-IPV6, AS-NET1-V6, AS-NET1OUT, AS-RETN-ACTUAL-V4, AS-RETN-ACTUAL-V6, AS-SEABONECUSTEU.

Internet exchanges

• DE-CIX Frankfurt — Frankfurt, Germany
• NetIX — Sofia, Bulgaria