$ query “AS4637” --type=asn → 1 result(s)

AS4637 · ASN-TELSTRA-GLOBAL

Telstra International Limited

AS4637 belongs to Telstra International Limited and is a major transit provider, based in Hong Kong SAR China. The system announces an impressive 1.2 million IPv4 addresses, including a /15, and supports IPv6. Most of its address space is geolocated to the United States, with additional presence in the United Kingdom and Hong Kong SAR China, and smaller footprints in 26 additional countries.

  • Top 5% — Top 5% of all autonomous systems by reach and degree
  • #14 by Reach — Top 100 by customer cone size
  • #2 in Hong Kong SAR China — Top 10 by reach within country

Basic Information

Country
🇭🇰 Hong Kong SAR China
Category
Internet Service Provider
Network Role
Major Transit
Data Origin
Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
Last Changed
March 04, 2026
Last Seen
October 10, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
666 / 281
IPv6 Prefixes (raw / aggregated)
105 / 4
IPv4 Addresses
1 245 696
Largest IPv4 Prefix
/15 (131 072 addresses)
Largest IPv6 Prefix
/31
Geolocated Countries
🇺🇸 United States (399 392 IPs), 🇬🇧 United Kingdom (305 584 IPs), 🇭🇰 Hong Kong SAR China (185 584 IPs) and 26 more
Prefix Changed
October 01, 2026

Reputation

Reputation
Pristine — 0 flagged IPs

Connectivity Summary

Upstream Providers
6 upstreams providing transit
Peers
293 networks exchanging traffic without transit
Downstream Customers
366 downstreams buying transit
Unclassified
7 unclassified BGP neighbors
Degree
672 unique BGP neighbors
Reach
7 171 networks in customer cone

Upstream Providers (6)

  • AS3356 — LEVEL3 (Tier-1 transit)
  • AS6461 — ZAYO-6461 (Tier-1 transit)
  • AS1299 — TWELVE99 (Tier-1 transit)
  • AS2914 — NTT-DATA-2914 (Tier-1 transit)
  • AS701 — UUNET (Tier-1 transit)
  • AS23764 — CTGNET

Prefix Lists

IPv4 Prefixes (666 total)

  • 195.152.0.0/15 (131 072 addresses (/15 prefix))
  • 13.142.0.0/16 (65 536 addresses (/16 prefix))
  • 134.159.0.0/16 (65 536 addresses (/16 prefix))
  • 146.101.0.0/16 (65 536 addresses (/16 prefix))
  • 154.32.0.0/16 (65 536 addresses (/16 prefix))
  • 42.99.128.0/17 (32 768 addresses (/17 prefix))
  • 64.145.128.0/17 (32 768 addresses (/17 prefix))
  • 74.3.0.0/17 (32 768 addresses (/17 prefix))
  • 202.84.128.0/17 (32 768 addresses (/17 prefix))
  • 61.14.128.0/18 (16 384 addresses (/18 prefix))
  • 61.87.128.0/18 (16 384 addresses (/18 prefix))
  • 120.138.192.0/18 (16 384 addresses (/18 prefix))
  • 122.152.128.0/18 (16 384 addresses (/18 prefix))
  • 125.252.64.0/18 (16 384 addresses (/18 prefix))
  • 199.0.0.0/18 (16 384 addresses (/18 prefix))
  • 202.64.128.0/18 (16 384 addresses (/18 prefix))
  • 202.126.128.0/18 (16 384 addresses (/18 prefix))
  • 202.147.0.0/18 (16 384 addresses (/18 prefix))
  • 202.227.128.0/18 (16 384 addresses (/18 prefix))
  • 203.123.128.0/18 (16 384 addresses (/18 prefix))
  • 203.192.128.0/18 (16 384 addresses (/18 prefix))
  • 207.15.64.0/18 (16 384 addresses (/18 prefix))
  • 208.9.128.0/18 (16 384 addresses (/18 prefix))
  • 61.8.32.0/19 (8 192 addresses (/19 prefix))
  • 63.160.224.0/19 (8 192 addresses (/19 prefix))
  • 63.161.224.0/19 (8 192 addresses (/19 prefix))
  • 63.164.160.0/19 (8 192 addresses (/19 prefix))
  • 63.172.128.0/19 (8 192 addresses (/19 prefix))
  • 63.175.32.0/19 (8 192 addresses (/19 prefix))
  • 65.160.160.0/19 (8 192 addresses (/19 prefix))
  • 65.161.96.0/19 (8 192 addresses (/19 prefix))
  • 65.163.96.0/19 (8 192 addresses (/19 prefix))
  • 65.166.32.0/19 (8 192 addresses (/19 prefix))
  • 65.166.192.0/19 (8 192 addresses (/19 prefix))
  • 65.167.0.0/19 (8 192 addresses (/19 prefix))
  • 65.167.160.0/19 (8 192 addresses (/19 prefix))
  • 65.170.224.0/19 (8 192 addresses (/19 prefix))
  • 65.171.32.0/19 (8 192 addresses (/19 prefix))
  • 65.171.192.0/19 (8 192 addresses (/19 prefix))
  • 65.173.160.0/19 (8 192 addresses (/19 prefix))
  • 65.174.32.0/19 (8 192 addresses (/19 prefix))
  • 101.167.192.0/19 (8 192 addresses (/19 prefix))
  • 144.223.96.0/19 (8 192 addresses (/19 prefix))
  • 144.224.32.0/19 (8 192 addresses (/19 prefix))
  • 144.224.64.0/19 (8 192 addresses (/19 prefix))
  • 144.230.0.0/19 (8 192 addresses (/19 prefix))
  • 144.230.96.0/19 (8 192 addresses (/19 prefix))
  • 154.8.0.0/19 (8 192 addresses (/19 prefix))
  • 179.236.160.0/19 (8 192 addresses (/19 prefix))
  • 193.82.96.0/19 (8 192 addresses (/19 prefix))

IPv6 Prefixes (105 total)

  • 2001:cc8::/31
  • 2001:cb0::/32
  • 2403:e800::/32
  • 2a02:1620::/32