$ 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