$ query “AS21574” --type=asn → 1 result(s)
AS21574 · CENTURY-TELECOM
Century Telecom Ltda
AS21574 is owned by Century Telecom Ltda and is a major transit provider, registered in Brazil since 2001. The system announces a respectable 13 312 IPv4 addresses, and supports IPv6. Its primary geographic footprint is in Brazil, with additional presence in Australia.
- 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 16, 2026 (active)
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
- 🇧🇷 Brazil (9 456 IPs), 🇦🇺 Australia (9 216 IPs)
- Prefix Changed
- April 25, 2026
Reputation
- Reputation
- Good — 1 flagged IPs out of 13 312 total (0.01%)
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 (5 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