$ query “AS3356” --type=asn → 1 result(s)

AS3356 · LEVEL3

Level 3 Communications

AS3356 belongs to Level 3 Communications and is a Tier-1 transit provider, based in the United States since 2002. The system announces a whopping 29.4 million IPv4 addresses (0.79% of routable IPv4 space), including a /9, and supports IPv6. The bulk of its IP address space is in the United States, with additional presence in the United Kingdom and Germany, and smaller footprints in 58 additional countries. Prefix announcements for this AS were recently updated.

  • Top 5% — Top 5% of all autonomous systems by reach and degree
  • Space Overlord — Over 10 million IPv4 addresses
  • #1 by Reach — Top 100 by customer cone size
  • #4 by Degree — Top 100 by unique BGP neighbor count
  • #1 in United States — Top 10 by reach within country

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
September 18, 2002
Last Changed
May 10, 2026
Last Seen
June 22, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
1 181 / 805
IPv6 Prefixes (raw / aggregated)
133 / 48
IPv4 Addresses
29 399 296
Largest IPv4 Prefix
/9 (8 388 608 addresses)
Largest IPv6 Prefix
/29
Geolocated Countries
🇺🇸 United States (36 843 552 IPs), 🇬🇧 United Kingdom (691 232 IPs), 🇩🇪 Germany (158 832 IPs) and 58 more
Prefix Changed
June 23, 2026

Reputation

Reputation
Good — 165 flagged IPs out of 29 399 296 total (0.00%)
Open Proxies
3 known open proxies in this network

Connectivity Summary

Peers
71 networks exchanging traffic without transit
Downstream Customers
6 484 downstreams buying transit
Unclassified
187 unclassified BGP neighbors
Degree
6 742 unique BGP neighbors
Reach
72 938 networks in customer cone

Prefix Lists

IPv4 Prefixes (1 181 total)

  • 4.0.0.0/9 (8 388 608 addresses (/9 prefix))
  • 8.0.0.0/9 (8 388 608 addresses (/9 prefix))
  • 8.224.0.0/11 (2 097 152 addresses (/11 prefix))
  • 8.192.0.0/12 (1 048 576 addresses (/12 prefix))
  • 204.160.0.0/13 (524 288 addresses (/13 prefix))
  • 67.24.0.0/13 (524 288 addresses (/13 prefix))
  • 64.152.0.0/13 (524 288 addresses (/13 prefix))
  • 63.208.0.0/13 (524 288 addresses (/13 prefix))
  • 65.88.0.0/14 (262 144 addresses (/14 prefix))
  • 206.240.0.0/14 (262 144 addresses (/14 prefix))
  • 207.120.0.0/14 (262 144 addresses (/14 prefix))
  • 64.192.0.0/14 (262 144 addresses (/14 prefix))
  • 205.128.0.0/14 (262 144 addresses (/14 prefix))
  • 199.92.0.0/14 (262 144 addresses (/14 prefix))
  • 209.244.0.0/14 (262 144 addresses (/14 prefix))
  • 65.56.0.0/14 (262 144 addresses (/14 prefix))
  • 216.140.0.0/14 (262 144 addresses (/14 prefix))
  • 205.180.0.0/14 (262 144 addresses (/14 prefix))
  • 67.96.0.0/14 (262 144 addresses (/14 prefix))
  • 205.224.0.0/14 (262 144 addresses (/14 prefix))
  • 198.76.0.0/14 (262 144 addresses (/14 prefix))
  • 198.92.0.0/14 (262 144 addresses (/14 prefix))
  • 206.32.0.0/14 (262 144 addresses (/14 prefix))
  • 67.72.0.0/14 (262 144 addresses (/14 prefix))
  • 198.112.0.0/14 (262 144 addresses (/14 prefix))
  • 204.198.0.0/15 (131 072 addresses (/15 prefix))
  • 199.76.0.0/15 (131 072 addresses (/15 prefix))
  • 69.44.0.0/15 (131 072 addresses (/15 prefix))
  • 72.236.0.0/15 (131 072 addresses (/15 prefix))
  • 199.78.0.0/16 (65 536 addresses (/16 prefix))
  • 64.200.0.0/16 (65 536 addresses (/16 prefix))
  • 198.31.0.0/16 (65 536 addresses (/16 prefix))
  • 171.75.0.0/16 (65 536 addresses (/16 prefix))
  • 199.75.0.0/16 (65 536 addresses (/16 prefix))
  • 65.77.0.0/16 (65 536 addresses (/16 prefix))
  • 166.90.0.0/16 (65 536 addresses (/16 prefix))
  • 192.216.0.0/16 (65 536 addresses (/16 prefix))
  • 192.221.0.0/16 (65 536 addresses (/16 prefix))
  • 156.139.0.0/16 (65 536 addresses (/16 prefix))
  • 62.67.0.0/16 (65 536 addresses (/16 prefix))
  • 209.0.0.0/16 (65 536 addresses (/16 prefix))
  • 207.83.0.0/16 (65 536 addresses (/16 prefix))
  • 192.233.0.0/16 (65 536 addresses (/16 prefix))
  • 216.202.0.0/16 (65 536 addresses (/16 prefix))
  • 131.119.0.0/16 (65 536 addresses (/16 prefix))
  • 217.163.0.0/16 (65 536 addresses (/16 prefix))
  • 207.227.0.0/16 (65 536 addresses (/16 prefix))
  • 209.84.0.0/16 (65 536 addresses (/16 prefix))
  • 192.239.0.0/16 (65 536 addresses (/16 prefix))
  • 212.187.128.0/17 (32 768 addresses (/17 prefix))

IPv6 Prefixes (133 total)

  • 2a10:2780::/29
  • 2001:13b2::/31
  • 2001:4c08::/32
  • 2c0f:f7f8::/32
  • 2a05:8944::/32
  • 2a05:8943::/32
  • 2806:281::/32
  • 2001:13b4::/32
  • 2606:840::/32
  • 2001:1900::/32
  • 2401:f6e0::/32
  • 2602:2f4::/44
  • 2620:12c:3000::/44
  • 2620:13d:2060::/46
  • 2a07:aa00:a::/47
  • 2620:130:800a::/47
  • 2a07:aa00:94::/47
  • 2a07:aa00:92::/47
  • 2a07:aa00:8c::/47
  • 2a07:aa00:86::/47
  • 2a07:aa00:e::/47
  • 2620:cc:4000::/48
  • 2a06:6541:2002::/48
  • 2001:13b0:c000::/48
  • 2620:123:d001::/48
  • 2001:13b0:8029::/48
  • 2620:a9:4000::/48
  • 2001:13b0:8021::/48
  • 2620:13d:d01c::/48
  • 2803:3250:eab4::/48
  • 2001:13b0:8015::/48
  • 2001:13b0:8013::/48
  • 2001:450:2015::/48
  • 2a06:6540:2002::/48
  • 2620:b0:4000::/48
  • 2a07:aa00:8::/48
  • 2001:428:3816::/48
  • 2620:9f:12::/48
  • 2a07:aa00:84::/48
  • 2620:7e:30e0::/48
  • 2001:13b0:a031::/48
  • 2a07:aa00:8f::/48
  • 2a07:aa00:91::/48
  • 2001:13b0:a301::/48
  • 2001:13b0:b900::/48
  • 2a07:aa00:96::/48
  • 2001:428:6400::/48
  • 2001:428:5805::/48