AS13819 — FWIN-NET

AS13819 announces 6 IPv4 prefixes covering 13,312 addresses and 1 IPv6 prefixes.

About this network

Eleven addresses answer with the same placeholder, and it ends in the name reserved for the loopback.

What it's used for

• A regional telephone and broadband provider. 13,312 addresses across 14 IPv4 prefixes, the IPv6 block 2001:4928::/32, and three observed BGP neighbours.

Notable

• Eleven of eighteen sampled addresses answered, every one of them undefined.hostname.localhost.
• Those answers span four separate blocks in two different parent ranges.
• The AS handle is FWIN-NET, four letters that match nothing in the registrant.
• Nine blocks are netname INDIGITAL-NET and two more are IND-NB-2.
• One of the twelve sampled blocks failed to return a registry record.

Interesting

• The last label of that name is reserved for the loopback address, so a public address claiming it is publishing a name that every resolver is entitled to treat as local. Any software that trusts a reverse lookup gets an answer pointing at the machine asking the question.
• A placeholder repeated across four blocks means the zone was generated once with a default that was never replaced. It is the same story as an empty zone, except that this one answers, so tools that check whether a name exists find one.
• A provider with a /32 of IPv6 and fourteen IPv4 pieces has done the modern work and left the reverse records where they started.

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

Announced prefixes

• 66.170.32.0/21
• 66.170.40.0/22
• 66.170.48.0/20
• 66.249.224.0/22
• 66.249.236.0/22
• 66.249.240.0/20
• 2001:4928::/32

Upstream networks

• AS6461 Zayo Bandwidth
• AS174 Cogent Communications, LLC

Downstream networks

• AS16698 NP Tech

Adjacent networks

• AS6461 Zayo Bandwidth
• AS174 Cogent Communications, LLC
• AS16698 NP Tech