subnet.im

AS28571UNIVERSIDADE DE SAO PAULO

BrazilRegistryLACNIC

As of 23rd October 2026, AS28571 (UNIVERSIDADE DE SAO PAULO), a network registered in Brazil with LACNIC, originates 37 IPv4 prefixes covering 164k addresses and 8 IPv6 prefixes. By IPv4 address space that makes it the 1,556th-largest of the 79,652 networks we see originating IPv4, and the 44th-largest of 7,988 in Brazil. It is seen behind 11 upstream networks, most often AS52468 (UFINET PANAMA S.A.) and AS1251 (FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO…). Every one of its announcements has a valid RPKI ROA, and none are RPKI-invalid. 98% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

37

IPv6 prefixes

8

IPv4 addresses

164k

IPv6 /64s

4.3B

Upstream graph

The networks AS28571 is seen behind, one and two hops out, drawn from real AS paths.

AS28571Toward the internet core
Upstream graph for AS28571: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS28571UNIVERSIDADE DE S…This networkAS1251FUNDAÇÃO DE AMPAR…AS1916RNP - Rede Nacion…AS6939Hurricane Electri…AS52468UFINET PANAMA S.A.AS61610ELEA DATA CENTERSAS15830Equinix, Inc.AS20080Florida Internati…AS18106Viewqwest Pte LtdAS20130Depaul UniversityAS1299Arelion (fka. Tel…AS22356Durand do Brasil …AS12956Telxius (Telefoni…

Networks observed one and two hops upstream of AS28571 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

61

adjacent networks

Upstreams
1118%
Peers
5082%
Downstreams
00%

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

Upstreams of AS28571
NetworkCountryRelationshipPathsVantage pts
AS52468UFINET PANAMA S.A.PAPeer1,989139
AS1251FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO SÃO PAULOBRPeer72550
AS61610ELEA DATA CENTERSBRPeer35530
AS6939Hurricane Electric LLCUSPeer11727
AS1916RNP - Rede Nacional de Ensino e PesquisaBRPeer5151
AS35280F5 Networks SARLFRPeer193
AS266213PLANETCLICK TELECOMUNICACOES LTDABRPeer182
AS32590Valve CorporationUSPeer182
AS14537Continent 8 LLCUSPeer183
AS137409GSL Networks Pty LTDAUPeer22

Prefixes

All 45

The largest blocks AS28571 originates, widest first.

Largest prefixes originated by AS28571
PrefixAddressesVisibility
143.107.0.0/1665.5k77/77
177.90.128.0/1732.8k77/77
177.90.64.0/1816.4k77/77
200.144.192.0/1816.4k77/77
200.144.160.0/198.2k77/77
200.17.16.0/204.1k77/77
200.136.0.0/204.1k77/77
200.144.48.0/204.1k77/77
200.144.184.0/212k77/77
200.144.244.0/221k77/77

Routing health

How AS28571'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

  • Valid100.0%45
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more97.8%44
  • Partially propagated40% to 90%2.2%1
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 37 prefixes

IPv6 — 8 prefixes

  • /324.3B × /6412.5%1
  • /4865.5k × /6487.5%7

Recent changes

Announcements that started or stopped since 23rd Sept 2026.

  • Withdrawn143.107.14.0/2417th Oct 2026
  • Withdrawn143.107.178.0/2317th Oct 2026
  • Withdrawn143.107.44.0/2317th Oct 2026
  • Withdrawn143.107.8.0/2417th Oct 2026
  • Withdrawn200.144.60.0/2417th Oct 2026
  • Withdrawn2001:12d0:8068::/4817th Oct 2026
  • Withdrawn2001:12d0:8070::/4817th Oct 2026
  • Announced2001:12d0:8130::/4816th Oct 2026
  • Withdrawn2001:12d0:8130::/4815th Oct 2026
  • Announced2001:12d0:8130::/4813th Oct 2026
  • Withdrawn2001:12d0:8130::/4813th Oct 2026
  • Announced200.144.174.0/2412th Oct 2026

8 announced and 18 withdrawn in all; the most recent are shown.

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