$ 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