AS21574 — AS21574 - Century Telecom Ltda

AS21574 announces 4 IPv4 prefixes covering 13,312 addresses and 1 IPv6 prefixes.

About this network

AS21574 is operated by Century Telecom Ltda.

What it's used for

• The address space carries residential and business internet access, evidenced by reverse DNS records pointing to centurytelecom.net.br and specific subnets like rede-precon.centurytelecom.net.br.
• The AS announces 13,312 IPv4 addresses across 8 prefixes and 1 IPv6 prefix, while maintaining 249 observed neighbours. This high neighbour count relative to the address inventory indicates a role focused on transit and peering for a regional Brazilian ISP.

Notable

• All registrants for the announced prefixes are listed as Century Telecom Ltda, matching the AS holder name.
• The address inventory is composed of multiple /20, /21, /22, /23, and /24 blocks, with the largest being 186.249.224.0/20 and 200.169.0.0/20.
• The network has been observed in routing tables since 2001-06-15.

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

Announced prefixes

• 168.227.200.0/22
• 186.249.224.0/20
• 187.1.176.0/20
• 200.169.0.0/20
• 2804:23ec::/32

Upstream networks

• AS263444 Open X Tecnologia Ltda
• AS3356 Level 3 Parent, LLC
• AS6939 Hurricane Electric LLC
• AS13786 Seabras 1 USA, LLC
• AS7195 EDGEUNO S.A.S
• AS24482 SG.GS
• AS267613 ELETRONET S.A.
• AS37721 Virtual Technologies & Solutions
• AS35280 F5 Networks SARL

Downstream networks

• AS262566 Link Sete Servicos de Internet e Redes Ltda
• AS263356 CNT Fiber
• AS61712 YUPNET TELECOMUNICACOES LTDA
• AS271338 TITAM NET TELECOM
• AS262674 Conquest Telecomunicacoes Ltda
• AS262624 INETSAFE COMERCIO DE EQUIPAMENTOS ELETRONICOS LTDA
• AS267070 Fibranet Juiz de Fora Servicos de Telecomunicacoes
• AS273350 Gns Telecom
• AS270897 SAFE SMART TREINAMENTO CONSULTORIA E TELECOM LTDA
• AS263277 Rnet Informatica Ltda
• AS265051 Speed Max Provedor de Internet Wireless LTDA-ME
• AS265460 LUP TELECOMUNICACOES LTDA
• AS28296 Acessa Telecomunicacoes Ltda
• AS267008 NET WAY TECNOLOGIA LTDA
• AS268882 Mais Rede Telecom
• AS262387 Intermicro Ltda
• AS61707 SYSVOIP TELECOMUNICACOES LTDA - ME
• AS61945 PIX BRASIL NETWORKS LTDA
• AS269199 INFOTEC TELECON LTDA
• AS271251 LAR NET TELECOMUNICACOES LTDA
• AS264455 STAR MAN NET PROVEDORA DE INTERNET LTDA - EPP
• AS264374 NCA Tecnologia Ltda
• AS268725 Planex Telecom
• AS52928 NORTETEL TELECOMUNICACOES LTDA
• AS264421 BrumaNet Telecom

Adjacent networks

• AS263444 Open X Tecnologia Ltda
• AS267613 ELETRONET S.A.
• AS61712 YUPNET TELECOMUNICACOES LTDA
• AS7195 EDGEUNO S.A.S
• AS1031 PEER 1031 LLC
• AS6939 Hurricane Electric LLC
• AS3356 Level 3 Parent, LLC
• AS52928 NORTETEL TELECOMUNICACOES LTDA
• AS262566 Link Sete Servicos de Internet e Redes Ltda
• AS263356 CNT Fiber
• AS271338 TITAM NET TELECOM
• AS262674 Conquest Telecomunicacoes Ltda
• AS262624 INETSAFE COMERCIO DE EQUIPAMENTOS ELETRONICOS LTDA
• AS267070 Fibranet Juiz de Fora Servicos de Telecomunicacoes
• AS28296 Acessa Telecomunicacoes Ltda
• AS273350 Gns Telecom
• AS270897 SAFE SMART TREINAMENTO CONSULTORIA E TELECOM LTDA
• AS263277 Rnet Informatica Ltda
• AS3303 Swisscom (Schweiz) AG
• AS269084 Global Tech Telecom Ltda - ME
• AS262387 Intermicro Ltda
• AS265051 Speed Max Provedor de Internet Wireless LTDA-ME
• AS265460 LUP TELECOMUNICACOES LTDA
• AS267008 NET WAY TECNOLOGIA LTDA
• AS268882 Mais Rede Telecom

Routing security

• RPKI: 0 valid, 0 invalid and 7 not-found announcements; 0 ROAs.
• ASPA: none published.
• IRR: 86% of announcements registered; 11 route objects.
• Listed in as-sets: AS-21574-BACKBONE, AS-267613, AS-AMERICANTOWER-CLIENTS-OF-CLIENTS, AS-CEMIGTELECOM-CLIENTS-OF-CLIENTS, AS-CTBC-CUSTOMERS1, AS-CTBC-CUSTOMERS93, AS-CTBC-TOOLS-1, AS-DECIX-SAO-CONNECTED, AS-DURAND1-CUSTOMER, AS-E1-AUTOMATION-CUSTOMER, AS-EMBRATELNET, AS-GNT-CUSTOMERS, AS-HURRICANEV6, AS-HWNG-DOWNSTREAMS, AS-ITXBR, AS-ITXBR1, AS-K2TELECOM-COSTUMERS, AS-MEGALINK, AS-OPENX-CUSTOMERS, AS-SB-AUTOMATION-CUSTOMER, AS-UFINET-LATAM-BRASIL, AS-UFLA-TRANSCUST, AS263903:AS-TRANSIT, AS264409:AS-CONE, AS271072:AS-CUSTOMERS-ALL.

Internet exchanges

• IX.br (PTT.br) São Paulo — São Paulo, Brazil
• IX.br (PTT.br) Fortaleza — Fortaleza, Brazil
• IX.br (PTT.br) Porto Alegre — Porto Alegre, Brazil
• IX.br (PTT.br) Curitiba — Curitiba, Brazil
• IX.br (PTT.br) Florianópolis — Florianópolis, Brazil
• IX.br (PTT.br) Belo Horizonte — Belo Horizonte, Brazil
• IX.br (PTT.br) Campinas — Campinas, Brazil