AS14571 — Oi S.A. - Em Recuperacao Judicial

Network type: hosting

AS14571 announces 14 IPv4 prefixes covering 54,784 addresses and 0 IPv6 prefixes.

About this network

The registry records a court proceeding in the holder's own name, and the address space underneath is registered to other companies.

What it's used for

• A Brazilian carrier's network. 59,136 addresses across 14 IPv4 prefixes, with three observed BGP neighbours and no IPv6 announced.

Notable

• The registry holder is Oi S.A. - Em Recuperacao Judicial.
• Every prefix that resolved is registered to ATIVA TELECOM LTDA, except one, 187.31.22.0/23, registered to MEGA INFRA SOLUCOES EM INFRAESTRUTURA LTDA.
• The netnames are bare numbers: 559062, 559047, 559061 and 558365.
• All 14 prefixes sit inside 187.31, from a /17 down to several /24s.
• Six of the twelve registry lookups failed outright.
• Eighteen addresses were queried for reverse DNS and none returned a name.

Interesting

• The holder string carries a legal status rather than a trading name. When a company enters court supervision the registry entry gets amended like any other corporate record, so the routing database ends up documenting the bankruptcy alongside the addresses.
• The AS still carries one company's name while the blocks underneath it carry another's. Address space moves faster than AS registrations do, and the two records disagree for years afterwards.
• Numeric netnames are registry ticket numbers, unique and uninformative. They identify the paperwork rather than the network.
• Half the lookups failing in one pack is a rate far above the usual, which is a property of the registry service that day rather than of the blocks themselves.

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

Announced prefixes

• 187.31.21.0/24
• 187.31.22.0/23
• 187.31.24.0/21
• 187.31.32.0/19
• 187.31.64.0/19
• 187.31.96.0/22
• 187.31.104.0/21
• 187.31.112.0/20
• 187.31.128.0/18
• 187.31.192.0/19
• 187.31.224.0/21
• 187.31.232.0/22
• 187.31.236.0/23
• 187.31.238.0/24

Upstream networks

• AS29987 Sinfony6, LLC

Downstream networks

• AS11993 BANCO DO BRASIL S.A.

Adjacent networks

• AS29987 Sinfony6, LLC
• AS11993 BANCO DO BRASIL S.A.
• AS8167 V tal

Internet exchanges

• IX.br (PTT.br) São Paulo — São Paulo, Brazil