$ query “AS209” --type=asn → 1 result(s)
AS209 — CENTURYLINK-US-LEGACY-QWEST
CenturyLink Communications LLC
AS209 is a Tier-1 transit provider run by CenturyLink Communications LLC, established in the United States in 1998. The network announces a whopping 19.9 million IPv4 addresses (0.54% of routable IPv4 space), including a /11. Supports IPv6.
- Top 5% — Top 5% of all autonomous systems by reach and degree
- Space Overlord — Over 10 million IPv4 addresses
- Pioneer — Registered before the year 2000
Basic Information
- Country
- 🇺🇸 United States
- Category
- Internet Service Provider
- Network Role
- Tier-1 Transit
- Data Origin
- Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
- Registered
- November 13, 1998
- Last Changed
- March 04, 2026
- Last Seen
- March 04, 2026
Prefix Summary
- IPv4 Prefixes (raw / aggregated)
- 1 634 / 259
- IPv6 Prefixes (raw / aggregated)
- 32 / 6
- IPv4 Addresses
- 19 864 320
- Largest IPv4 Prefix
- /11 (2 097 152 addresses)
- Largest IPv6 Prefix
- /24
- Geolocated Countries
- 🇺🇸 US (1 151 IPs), 🇦🇺 AU (20 IPs), 🇨🇦 CA (16 IPs), 🇯🇵 JP, 🇬🇧 GB, 🇦🇷 AR, 🇮🇳 IN, 🇸🇬 SG, 🇲🇴 MO, 🇭🇰 HK, 🇨🇳 CN, 🇮🇱 IL, 🇮🇸 IS, 🇧🇪 BE
- Prefix Changed
- March 04, 2026
Reputation
- Reputation
- Good — 68 flagged IPs out of 19 864 320 total (0.00%)
Connectivity Summary
- Upstream Providers
- 0 upstream autonomous systems providing transit
- Peers
- 24 autonomous systems exchanging traffic without transit fees
- Downstream Customers
- 423 downstream autonomous systems buying transit
- Degree
- 456 unique BGP neighbors (providers + customers + peers)
- Reach
- 21 159 — customer cone size measuring network influence
- Degree Rank
- #302
- Reach Rank
- #389
Prefix Lists
IPv4 Prefixes (1 634 total)
- 65.128.0.0/11 (2 097 152 addresses)
- 63.144.0.0/12 (1 048 576 addresses)
- 63.224.0.0/12 (1 048 576 addresses)
- 65.112.0.0/12 (1 048 576 addresses)
- 71.208.0.0/12 (1 048 576 addresses)
- 75.160.0.0/12 (1 048 576 addresses)
- 97.112.0.0/12 (1 048 576 addresses)
- 174.16.0.0/12 (1 048 576 addresses)
- 67.0.0.0/13 (524 288 addresses)
- 67.128.0.0/13 (524 288 addresses)
- 67.232.0.0/13 (524 288 addresses)
- 71.32.0.0/13 (524 288 addresses)
- 71.48.0.0/13 (524 288 addresses)
- 76.0.0.0/13 (524 288 addresses)
- 184.0.0.0/13 (524 288 addresses)
- 184.96.0.0/13 (524 288 addresses)
- 65.100.0.0/14 (262 144 addresses)
- 70.56.0.0/14 (262 144 addresses)
- 71.0.0.0/14 (262 144 addresses)
- 184.156.0.0/14 (262 144 addresses)
- 205.168.0.0/14 (262 144 addresses)
- 208.44.0.0/14 (262 144 addresses)
- 65.40.0.0/15 (131 072 addresses)
- 67.40.0.0/15 (131 072 addresses)
- 67.76.0.0/15 (131 072 addresses)
- 68.176.0.0/15 (131 072 addresses)
- 69.68.0.0/15 (131 072 addresses)
- 72.160.0.0/15 (131 072 addresses)
- 72.164.0.0/15 (131 072 addresses)
- 74.4.0.0/15 (131 072 addresses)
- 75.120.0.0/15 (131 072 addresses)
- 99.194.0.0/15 (131 072 addresses)
- 204.132.0.0/15 (131 072 addresses)
- 207.108.0.0/15 (131 072 addresses)
- 207.118.0.0/15 (131 072 addresses)
- 207.224.0.0/15 (131 072 addresses)
- 209.180.0.0/15 (131 072 addresses)
- 216.160.0.0/15 (131 072 addresses)
- 216.206.0.0/15 (131 072 addresses)
- 66.77.0.0/16 (65 536 addresses)
- 67.42.0.0/16 (65 536 addresses)
- 67.148.0.0/16 (65 536 addresses)
- 69.29.0.0/16 (65 536 addresses)
- 69.34.0.0/16 (65 536 addresses)
- 69.179.0.0/16 (65 536 addresses)
- 72.166.0.0/16 (65 536 addresses)
- 98.125.0.0/16 (65 536 addresses)
- 138.210.0.0/16 (65 536 addresses)
- 144.163.0.0/16 (65 536 addresses)
- 162.104.0.0/16 (65 536 addresses)
IPv6 Prefixes (32 total)
- 2602::/24
- 2001:428::/32
- 2001:460::/32
- 2604:8c0::/32
- 2606:5000::/32
- 2620:13d:2060::/46