$ query “AS3300” --type=asn → 1 result(s)

AS3300 · BT

British Telecommunications Limited

AS3300 is run by British Telecommunications Limited and is a mid-size transit provider, based in the United Kingdom since 2002. The system announces a solid 513 280 IPv4 addresses, including a /16, and supports IPv6. Its primary geographic footprint is in the United States, with additional presence in the United Kingdom and Singapore, and smaller footprints in 53 additional countries.

  • Top 5% — Top 5% of all autonomous systems by reach and degree

Basic Information

Country
🇬🇧 United Kingdom
Category
Internet Service Provider
Network Role
Mid-size Transit
Data Origin
Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
Registered
September 19, 2002
Last Changed
June 30, 2026
Last Seen
July 19, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
122 / 44
IPv6 Prefixes (raw / aggregated)
29 / 2
IPv4 Addresses
513 280
Largest IPv4 Prefix
/16 (65 536 addresses)
Largest IPv6 Prefix
/32
Geolocated Countries
🇺🇸 United States (474 464 IPs), 🇬🇧 United Kingdom (173 888 IPs), 🇸🇬 Singapore (88 800 IPs) and 53 more
Prefix Changed
June 12, 2026

Reputation

Reputation
Pristine — 0 flagged IPs

Connectivity Summary

Upstream Providers
8 upstreams providing transit
Peers
66 networks exchanging traffic without transit
Downstream Customers
21 downstreams buying transit
Unclassified
1 unclassified BGP neighbor
Degree
96 unique BGP neighbors
Reach
22 networks in customer cone

Upstream Providers (8)

  • AS6461 — MFNX (Tier-1 transit)
  • AS1299 — TWELVE99 (Tier-1 transit)
  • AS30844 — LIQUID-AS
  • AS2914 — NTT-DATA-2914 (Tier-1 transit)
  • AS3491 — PCCWG-AS (Tier-1 transit)
  • AS6762 — SEABONE-NET (Tier-1 transit)
  • AS4637 — ASN-TELSTRA-GLOBAL
  • AS4657 — STARHUB-INTERNET

Prefix Lists

IPv4 Prefixes (122 total)

  • 205.248.0.0/16 (65 536 addresses (/16 prefix))
  • 209.28.0.0/16 (65 536 addresses (/16 prefix))
  • 207.209.0.0/16 (65 536 addresses (/16 prefix))
  • 207.117.0.0/16 (65 536 addresses (/16 prefix))
  • 206.182.0.0/16 (65 536 addresses (/16 prefix))
  • 204.231.0.0/17 (32 768 addresses (/17 prefix))
  • 204.231.128.0/18 (16 384 addresses (/18 prefix))
  • 204.140.64.0/18 (16 384 addresses (/18 prefix))
  • 63.250.128.0/18 (16 384 addresses (/18 prefix))
  • 199.6.64.0/18 (16 384 addresses (/18 prefix))
  • 198.207.64.0/18 (16 384 addresses (/18 prefix))
  • 192.237.64.0/18 (16 384 addresses (/18 prefix))
  • 61.14.0.0/18 (16 384 addresses (/18 prefix))
  • 203.187.128.0/19 (8 192 addresses (/19 prefix))
  • 192.92.32.0/19 (8 192 addresses (/19 prefix))
  • 192.157.144.0/20 (4 096 addresses (/20 prefix))
  • 72.29.128.0/20 (4 096 addresses (/20 prefix))
  • 192.157.136.0/21 (2 048 addresses (/21 prefix))
  • 192.92.24.0/21 (2 048 addresses (/21 prefix))
  • 192.92.20.0/22 (1 024 addresses (/22 prefix))
  • 192.157.132.0/22 (1 024 addresses (/22 prefix))
  • 136.238.238.0/23 (512 addresses (/23 prefix))
  • 192.157.130.0/23 (512 addresses (/23 prefix))
  • 192.157.160.0/23 (512 addresses (/23 prefix))
  • 192.92.18.0/23 (512 addresses (/23 prefix))
  • 192.92.80.0/23 (512 addresses (/23 prefix))
  • 136.238.240.0/23 (512 addresses (/23 prefix))
  • 185.249.5.0/24 (256 addresses (/24 prefix))
  • 195.206.69.0/24 (256 addresses (/24 prefix))
  • 198.178.237.0/24 (256 addresses (/24 prefix))
  • 198.178.239.0/24 (256 addresses (/24 prefix))
  • 185.249.6.0/24 (256 addresses (/24 prefix))
  • 195.206.70.0/24 (256 addresses (/24 prefix))
  • 136.238.243.0/24 (256 addresses (/24 prefix))
  • 204.52.187.0/24 (256 addresses (/24 prefix))
  • 204.79.84.0/24 (256 addresses (/24 prefix))
  • 198.137.75.0/24 (256 addresses (/24 prefix))
  • 192.92.82.0/24 (256 addresses (/24 prefix))
  • 136.238.232.0/24 (256 addresses (/24 prefix))
  • 136.238.229.0/24 (256 addresses (/24 prefix))
  • 136.238.187.0/24 (256 addresses (/24 prefix))
  • 136.238.185.0/24 (256 addresses (/24 prefix))
  • 136.238.168.0/24 (256 addresses (/24 prefix))
  • 194.33.52.0/24 (256 addresses (/24 prefix))

IPv6 Prefixes (29 total)

  • 2402:fb00::/32
  • 2606:f100::/32