$ query “AS3561” --type=asn → 1 result(s)
AS3561 — CENTURYLINK-LEGACY-SAVVIS
CenturyLink Communications LLC
AS3561 is a mid-size transit provider registered to CenturyLink Communications LLC, established in the United States in 1998. The network announces an impressive 8.9 million IPv4 addresses, including a /13. Supports IPv6.
- Top 5% — Top 5% of all autonomous systems by reach and degree
- Pioneer — Registered before the year 2000
Basic Information
- Country
- 🇺🇸 United States
- Category
- Hosting
- Network Role
- Mid-size Transit
- Data Origin
- Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
- Registered
- October 07, 1998
- Last Changed
- March 04, 2026
- Last Seen
- March 05, 2026
Prefix Summary
- IPv4 Prefixes (raw / aggregated)
- 659 / 343
- IPv6 Prefixes (raw / aggregated)
- 2 / 2
- IPv4 Addresses
- 8 920 320
- Largest IPv4 Prefix
- /13 (524 288 addresses)
- Largest IPv6 Prefix
- /46
- Geolocated Countries
- 🇺🇸 US (967 IPs), 🇨🇦 CA (171 IPs), 🇭🇰 HK (25 IPs), 🇬🇧 GB, 🇯🇵 JP, 🇧🇲 BM, 🇸🇬 SG, 🇷🇴 RO, 🇵🇰 PK, 🇫🇷 FR, 🇩🇪 DE, 🇦🇺 AU, 🇳🇱 NL, 🇨🇭 CH and 22 more
- Prefix Changed
- March 04, 2026
Reputation
- Reputation
- Good — 2 flagged IPs out of 8 920 320 total (0.00%)
Connectivity Summary
- Upstream Providers
- 3 upstream autonomous systems providing transit
- Peers
- 2 autonomous systems exchanging traffic without transit fees
- Downstream Customers
- 57 downstream autonomous systems buying transit
- Degree
- 64 unique BGP neighbors (providers + customers + peers)
- Reach
- 58 — customer cone size measuring network influence
- Degree Rank
- #2 509
- Reach Rank
- #1 420
Upstream Providers (3)
Prefix Lists
IPv4 Prefixes (659 total)
- 208.144.0.0/13 (524 288 addresses)
- 64.240.0.0/14 (262 144 addresses)
- 206.100.0.0/14 (262 144 addresses)
- 208.140.0.0/14 (262 144 addresses)
- 208.152.0.0/14 (262 144 addresses)
- 216.32.0.0/14 (262 144 addresses)
- 216.88.0.0/14 (262 144 addresses)
- 63.128.0.0/15 (131 072 addresses)
- 66.100.0.0/15 (131 072 addresses)
- 204.70.0.0/15 (131 072 addresses)
- 205.138.0.0/15 (131 072 addresses)
- 205.218.0.0/15 (131 072 addresses)
- 206.26.0.0/15 (131 072 addresses)
- 206.30.0.0/15 (131 072 addresses)
- 206.156.0.0/15 (131 072 addresses)
- 207.0.0.0/15 (131 072 addresses)
- 207.48.0.0/15 (131 072 addresses)
- 208.128.0.0/15 (131 072 addresses)
- 208.134.0.0/15 (131 072 addresses)
- 208.136.0.0/15 (131 072 addresses)
- 208.158.0.0/15 (131 072 addresses)
- 208.160.0.0/15 (131 072 addresses)
- 208.164.0.0/15 (131 072 addresses)
- 208.170.0.0/15 (131 072 addresses)
- 63.137.0.0/16 (65 536 addresses)
- 64.14.0.0/16 (65 536 addresses)
- 165.193.0.0/16 (65 536 addresses)
- 167.215.0.0/16 (65 536 addresses)
- 204.189.0.0/16 (65 536 addresses)
- 205.136.0.0/16 (65 536 addresses)
- 205.216.0.0/16 (65 536 addresses)
- 206.25.0.0/16 (65 536 addresses)
- 206.79.0.0/16 (65 536 addresses)
- 206.98.0.0/16 (65 536 addresses)
- 206.129.0.0/16 (65 536 addresses)
- 206.142.0.0/16 (65 536 addresses)
- 206.150.0.0/16 (65 536 addresses)
- 206.152.0.0/16 (65 536 addresses)
- 206.155.0.0/16 (65 536 addresses)
- 207.3.0.0/16 (65 536 addresses)
- 207.51.0.0/16 (65 536 addresses)
- 207.82.0.0/16 (65 536 addresses)
- 207.124.0.0/16 (65 536 addresses)
- 207.149.0.0/16 (65 536 addresses)
- 208.130.0.0/16 (65 536 addresses)
- 208.133.0.0/16 (65 536 addresses)
- 208.139.0.0/16 (65 536 addresses)
- 208.156.0.0/16 (65 536 addresses)
- 208.162.0.0/16 (65 536 addresses)
- 208.172.0.0/16 (65 536 addresses)
IPv6 Prefixes (2 total)
- 2001:460:78::/46
- 2001:460:100::/46