AS39135 — FIBER1

AS39135 announces 4 IPv4 prefixes covering 9,984 addresses and 0 IPv6 prefixes.

About this network

The AS handle FIBER1 is operated by Fiber 1 Ltd.

What it's used for

• The address space carries residential and business internet traffic, evidenced by reverse DNS entries such as ip-77.238.87.254.fiber1.bg and 212-5-129-64.ip.btc-net.bg.
• The network announces 9,984 IPv4 addresses across 4 prefixes and maintains 2 observed neighbours, a ratio indicative of an access or eyeball network rather than a transit provider.
• As a subscription-based service provider in Sofia, the traffic consists primarily of subscriber internet access and associated media delivery.

Notable

• Registrants for the majority of prefixes align with the announcer, specifically Fiber 1 Ltd. for 77.238.64.0/19 and 185.73.56.0/22, while 212.5.129.0/24 is registered to Vivacom Bulgaria EAD.
• The address inventory is composed of four distinct IPv4 blocks, with the largest being 77.238.64.0/19, and no IPv6 prefixes are currently announced.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 77.238.64.0/19
• 94.72.156.0/23
• 185.73.56.0/22
• 212.5.129.0/24

Upstream networks

• AS57344 Telehouse EAD
• AS31287 IPACCT CABLE Ltd

Adjacent networks

• AS57344 Telehouse EAD
• AS31287 IPACCT CABLE Ltd

Routing security

• RPKI: 4 valid, 0 invalid and 0 not-found announcements; 5 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 7 route objects.
• Listed in as-sets: AS-BTC-UP, AS-FIBER1, AS-IPACCT, AS-NETERRA-BG, AS-RETN-ACTUAL-V4.