subnet.im

AS18881TELEFÔNICA BRASIL LTDA

BrazilRegistryLACNICTypeEyeball

As of 11th November 2026, AS18881 (TELEFÔNICA BRASIL LTDA), an access network registered in Brazil with LACNIC, originates 978 IPv4 prefixes covering 8.9M addresses and 72 IPv6 prefixes. By IPv4 address space that makes it the 78th-largest of the 80,743 networks we see originating IPv4, and the 4th-largest of 8,031 in Brazil. It is seen behind 1 upstream network, most often AS10429 (Vivo (Telefônica Brasil)), and in front of 1 downstream network. None of its announcements have a valid RPKI ROA. 98% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

978

IPv6 prefixes

72

IPv4 addresses

8.9M

IPv6 /64s

44.2B

Upstream graph

The networks AS18881 is seen behind, one and two hops out, drawn from real AS paths.

AS18881Toward the internet core
Upstream graph for AS18881: 3 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS18881TELEFÔNICA BRASIL…This networkAS10429Vivo (Telefônica …AS1000LINK AMERICANAS12956Telxius (Telefoni…

Networks observed one and two hops upstream of AS18881 in real AS paths. A thicker line means more vantage points saw that adjacency, so weight tracks how well attested it is — not how much traffic it carries. Adjacency is an observation; whether it is a transit purchase or a settlement-free peering is an inference, and is labelled as one wherever we show it.

Neighbouring networks

84

adjacent networks

Upstreams
11%
Peers
8298%
Downstreams
11%

Networks carrying this one's traffic toward the rest of the internet.

Upstreams of AS18881
NetworkCountryRelationshipPathsVantage pts
AS10429Vivo (Telefônica Brasil)BRPeer76,847138

Prefixes

All 1,050

The largest blocks AS18881 originates, widest first.

Largest prefixes originated by AS18881
PrefixAddressesVisibility
177.16.0.0/14262k76/76
177.40.0.0/14262k76/76
177.96.0.0/14262k76/76
177.132.0.0/14262k76/76
177.156.0.0/14262k76/76
177.204.0.0/14262k76/76
179.176.0.0/14262k76/76
179.180.0.0/14262k76/76
179.184.0.0/14262k76/76
186.212.0.0/14262k76/76

Routing health

How AS18881's own announcements validate against RPKI and how far they propagate. The same measures for the whole routing table are on the routing table in numbers.

RPKI origin validation

  • Valid0.0%0
  • Invalid0.0%0
  • No ROA100.0%1,050

Propagation

  • Globally propagated90% of full-feed peers or more97.5%1,024
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%2.5%26

Prefix sizes

IPv4 — 978 prefixes

IPv6 — 72 prefixes

  • /332.1B × /6413.9%10
  • /341.1B × /649.7%7
  • /35537M × /6427.8%20
  • /36268M × /6419.4%14
  • /37134M × /645.6%4
  • /3867.1M × /641.4%1
  • /3933.6M × /641.4%1
  • /4016.8M × /645.6%4
  • /418.4M × /646.9%5
  • /46262k × /642.8%2
  • /47131k × /644.2%3
  • /4865.5k × /641.4%1

Recent changes

Announcements that started or stopped since 12th Oct 2026.

40 announced and 15 withdrawn in all; the most recent are shown.

Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.