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AS21574Century Telecom Ltda

BrazilRegistryLACNICTypeEyeball

As of 26th September 2026, AS21574 (Century Telecom Ltda), an access network registered in Brazil with LACNIC, originates 6 IPv4 prefixes covering 13.8k addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 8,836th-largest of the 79,516 networks we see originating IPv4, and the 527th-largest of 7,982 in Brazil. It is seen behind 44 upstream networks, most often AS7195 (EdgeUno) and AS263444 (Open X Tecnologia Ltda), and in front of 107 downstream networks. None of its announcements have a valid RPKI ROA. 71% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

6

IPv6 prefixes

1

IPv4 addresses

13.8k

IPv6 /64s

4.3B

Upstream graph

The networks AS21574 is seen behind, one and two hops out, drawn from real AS paths.

AS21574Toward the internet core
Upstream graph for AS21574: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS21574Century Telecom L…This networkAS1031PEER 1031 LLCAS3356Lumen (Level 3)AS7195EdgeUnoAS7713PT Telkom Indones…AS263444Open X Tecnologia…AS6939Hurricane Electri…AS3549Lumen (fka. Globa…AS6453TATA Communicatio…AS1299Arelion (fka. Tel…AS32590Valve CorporationAS2914NTT America, Inc.AS57463NetIX Communicati…

Networks observed one and two hops upstream of AS21574 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

450

adjacent networks

Upstreams
4410%
Peers
29966%
Downstreams
10724%

Networks carrying this one's traffic toward the rest of the internet. Listing the 40 seen on the most AS paths, of 44.

Upstreams of AS21574
NetworkCountryRelationshipPathsVantage pts
AS7195EdgeUnoCOPeer8,365125
AS263444Open X Tecnologia LtdaBRPeer8,08889
AS3356Lumen (Level 3)USPeer2,90385
AS1031PEER 1031 LLCUSPeer1,42014
AS7713PT Telkom Indonesia TbkIDPeer1,2983
AS35280F5 Networks SARLFRPeer9285
AS267613ELETRONET S.A.BRPeer92231
AS6939Hurricane Electric LLCUSPeer80633
AS25091IP-Max SACHPeer7384
AS8888xTom Pty LtdAUPeer7372

Prefixes

The largest blocks AS21574 originates, widest first.

Largest prefixes originated by AS21574
PrefixAddressesVisibility
186.249.224.0/204.1k81/81
187.1.176.0/204.1k81/81
200.169.0.0/204.1k81/81
168.227.200.0/221k81/81
187.1.176.0/2425614/81
187.1.178.0/2425638/81
2804:23ec::/324.3B × /6464/64

Routing health

How AS21574'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%7

Propagation

  • Globally propagated90% of full-feed peers or more71.4%5
  • Partially propagated40% to 90%14.3%1
  • Seen by few peersUnder 40%14.3%1

Prefix sizes

IPv4 — 6 prefixes

IPv6 — 1 prefixes

  • /324.3B × /64100.0%1

Recent changes

Announcements that started or stopped since 28th Aug 2026.

No announcement by AS21574 started or stopped in this period.

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