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

AS21574 — CENTURY-TELECOM

Century Telecom Ltda

AS21574 is a major transit provider operated by Century Telecom Ltda, registered in Brazil since 2001. The network announces a respectable 13 312 IPv4 addresses. Supports IPv6.

  • 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
March 04, 2026

Prefix Summary

IPv4 Prefixes (raw / aggregated)
5 / 4
IPv6 Prefixes (raw / aggregated)
1 / 1
IPv4 Addresses
13 312
Largest IPv4 Prefix
/20 (4 096 addresses)
Largest IPv6 Prefix
/32
Geolocated Countries
🇧🇷 BR (61 IPs), 🇦🇺 AU (3 IPs)
Prefix Changed
March 04, 2026

Reputation

Reputation
Good — 2 flagged IPs out of 13 312 total (0.02%)

Connectivity Summary

Upstream Providers
5 upstream autonomous systems providing transit
Peers
119 autonomous systems exchanging traffic without transit fees
Downstream Customers
98 downstream autonomous systems buying transit
Degree
237 unique BGP neighbors (providers + customers + peers)
Reach
313 — customer cone size measuring network influence
Degree Rank
#547
Reach Rank
#742

Upstream Providers (5)

Prefix Lists

IPv4 Prefixes (5 total)

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

IPv6 Prefixes (1 total)

  • 2804:23ec::/32