AS13124 — A1BG_RSD

AS13124 announces 181 IPv4 prefixes covering 308,480 addresses and 42 IPv6 prefixes.

About this network

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-MTELNET dates from 2005 to 2012 with A1-NET and A1-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.

Announced prefixes

• 5.53.128.0/19
• 5.53.160.0/20
• 5.53.177.0/24
• 5.53.178.0/23
• 5.53.184.0/21
• 5.53.192.0/19
• 5.53.224.0/21
• 5.53.232.0/22
• 5.53.236.0/23
• 5.53.238.0/24
• 5.53.248.0/21
• 37.130.240.0/21
• 62.221.129.0/24
• 62.221.130.0/23
• 62.221.134.0/23
• 62.221.136.0/22
• 62.221.140.0/24
• 62.221.142.0/23
• 62.221.144.0/20
• 77.236.160.0/21
• 77.236.169.0/24
• 77.236.170.0/23
• 77.236.172.0/22
• 77.236.176.0/23
• 77.236.179.0/24
• 77.236.180.0/23
• 77.236.183.0/24
• 77.236.184.0/21
• 77.244.192.0/20
• 80.253.50.0/24
• 80.253.56.0/23
• 80.253.58.0/24
• 80.253.60.0/22
• 84.252.1.0/24
• 84.252.2.0/23
• 84.252.4.0/22
• 84.252.8.0/22
• 84.252.12.0/23
• 84.252.15.0/24
• 84.252.16.0/20
• 84.252.32.0/21
• 84.252.42.0/23
• 84.252.44.0/22
• 84.252.48.0/22
• 84.252.52.0/23
• 84.252.54.0/24
• 84.252.56.0/21
• 85.91.128.0/21
• 85.118.87.0/24
• 85.130.0.0/19
• 85.130.32.0/21
• 85.130.40.0/22
• 85.130.44.0/23
• 85.130.46.0/24
• 85.130.48.0/21
• 85.130.56.0/22
• 85.130.62.0/24
• 85.130.64.0/21
• 85.130.79.0/24
• 85.130.80.0/21
• 85.130.88.0/22
• 85.130.92.0/23
• 85.130.94.0/24
• 85.130.98.0/23
• 85.130.100.0/22
• 85.130.104.0/22
• 85.130.108.0/23
• 85.130.112.0/21
• 85.130.123.0/24
• 85.130.124.0/22
• 87.97.128.0/19
• 87.97.164.0/22
• 87.97.168.0/21
• 87.97.176.0/23
• 87.97.178.0/24
• 87.97.180.0/22
• 87.97.184.0/21
• 87.97.192.0/19
• 87.97.224.0/20
• 87.97.244.0/22
• 87.97.248.0/21
• 89.186.200.0/22
• 89.215.0.0/21
• 89.215.12.0/22
• 89.215.16.0/20
• 89.215.32.0/21
• 89.215.40.0/23
• 89.215.43.0/24
• 89.215.44.0/22
• 89.215.52.0/22
• 89.215.56.0/22
• 89.215.60.0/23
• 89.215.64.0/18
• 89.215.128.0/19
• 89.215.160.0/21
• 89.215.169.0/24
• 89.215.171.0/24
• 89.215.172.0/24
• 89.215.175.0/24
• 89.215.176.0/23

and 123 more.

Upstream networks

• AS8717 A1 Bulgaria EAD

Adjacent networks

• AS8717 A1 Bulgaria EAD

Internet exchanges

• DE-CIX Frankfurt — Frankfurt, Germany