$ query “AS21574” --type=asn → 1 result(s)

AS21574 · CENTURY-TELECOM

Century Telecom Ltda

AS21574 belongs to Century Telecom Ltda and is a major transit provider, based in Brazil since 2001. The system announces a respectable 13 312 IPv4 addresses, and supports IPv6. The bulk of its IP address space is in Brazil, with additional presence in Australia. This AS has recently updated its prefix announcements.

  • Top 5% — Top 5% of all autonomous systems by reach and degree

Basic Information

Country
🇧🇷 Brazil
Category
Internet Service Provider
Network Role
Major Transit
Data Origin
Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
Registered
June 07, 2001
Last Changed
March 04, 2026
Last Seen
June 22, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
6 / 4
IPv6 Prefixes (raw / aggregated)
1 / 1
IPv4 Addresses
13 312
Largest IPv4 Prefix
/20 (4 096 addresses)
Largest IPv6 Prefix
/32
Geolocated Countries
🇧🇷 Brazil (9 456 IPs), 🇦🇺 Australia (9 216 IPs)
Prefix Changed
June 19, 2026

Reputation

Reputation
Pristine — 0 flagged IPs

Connectivity Summary

Upstream Providers
6 upstreams providing transit
Peers
127 networks exchanging traffic without transit
Downstream Customers
104 downstreams buying transit
Unclassified
11 unclassified BGP neighbors
Degree
248 unique BGP neighbors
Reach
288 networks in customer cone

Upstream Providers (6)

Prefix Lists

IPv4 Prefixes (6 total)

  • 186.249.224.0/20 (4 096 addresses (/20 prefix))
  • 187.1.176.0/20 (4 096 addresses (/20 prefix))
  • 200.169.0.0/20 (4 096 addresses (/20 prefix))
  • 168.227.200.0/22 (1 024 addresses (/22 prefix))

IPv6 Prefixes (1 total)

  • 2804:23ec::/32