$ query “AS19905” --type=asn → 1 result(s)

AS19905 · ARBORCLOUD

Arbor Cloud

AS19905 is run by Arbor Cloud and is a mid-size transit provider, based in the United States since 2007. The system announces a respectable 36 608 IPv4 addresses, and supports IPv6. The bulk of its IP address space is in the United States, with additional presence in Australia and Saudi Arabia, and smaller footprints in 10 additional countries. This AS's prefix announcements have been recently modified.

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

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
August 24, 2007
Last Changed
July 22, 2026
Last Seen
August 10, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
137 / 84
IPv6 Prefixes (raw / aggregated)
25 / 14
IPv4 Addresses
36 608
Largest IPv4 Prefix
/20 (4 096 addresses)
Largest IPv6 Prefix
/45
Geolocated Countries
🇺🇸 United States (19 200 IPs), 🇦🇺 Australia (7 936 IPs), 🇸🇦 Saudi Arabia (7 424 IPs) and 10 more
Prefix Changed
August 11, 2026

Reputation

Reputation
Pristine — 0 flagged IPs

Connectivity Summary

Upstream Providers
8 upstreams providing transit
Peers
3 networks exchanging traffic without transit
Downstream Customers
38 downstreams buying transit
Degree
49 unique BGP neighbors
Reach
79 networks in customer cone

Upstream Providers (8)

  • AS6461 — MFNX (Tier-1 transit)
  • AS3257 — GTT-BACKBONE (Tier-1 transit)
  • AS2914 — NTT-DATA-2914 (Tier-1 transit)
  • AS15830 — EQUINIX
  • AS6453 — AS6453 (Tier-1 transit)
  • AS4637 — ASN-TELSTRA-GLOBAL
  • AS12956 — TELXIUS (Tier-1 transit)
  • AS260 — GTT-DXB

Prefix Lists

IPv4 Prefixes (137 total)

  • 156.154.208.0/20 (4 096 addresses (/20 prefix))
  • 139.104.72.0/21 (2 048 addresses (/21 prefix))
  • 156.154.224.0/21 (2 048 addresses (/21 prefix))
  • 156.154.240.0/22 (1 024 addresses (/22 prefix))
  • 156.154.160.0/22 (1 024 addresses (/22 prefix))
  • 156.154.236.0/23 (512 addresses (/23 prefix))
  • 156.154.164.0/23 (512 addresses (/23 prefix))
  • 217.173.92.0/23 (512 addresses (/23 prefix))
  • 74.115.26.0/23 (512 addresses (/23 prefix))
  • 217.173.88.0/23 (512 addresses (/23 prefix))
  • 217.169.196.0/23 (512 addresses (/23 prefix))
  • 217.169.194.0/23 (512 addresses (/23 prefix))
  • 204.138.240.0/23 (512 addresses (/23 prefix))
  • 204.115.14.0/23 (512 addresses (/23 prefix))
  • 204.13.136.0/23 (512 addresses (/23 prefix))
  • 199.7.64.0/23 (512 addresses (/23 prefix))
  • 91.102.234.0/23 (512 addresses (/23 prefix))
  • 91.102.236.0/23 (512 addresses (/23 prefix))
  • 195.114.106.0/23 (512 addresses (/23 prefix))
  • 91.229.32.0/23 (512 addresses (/23 prefix))
  • 95.140.160.0/23 (512 addresses (/23 prefix))
  • 193.19.90.0/23 (512 addresses (/23 prefix))
  • 185.148.150.0/23 (512 addresses (/23 prefix))
  • 184.185.28.0/23 (512 addresses (/23 prefix))
  • 178.249.176.0/23 (512 addresses (/23 prefix))
  • 156.154.246.0/23 (512 addresses (/23 prefix))
  • 156.154.120.0/23 (512 addresses (/23 prefix))
  • 156.154.232.0/23 (512 addresses (/23 prefix))
  • 156.154.178.0/23 (512 addresses (/23 prefix))
  • 68.71.223.0/24 (256 addresses (/24 prefix))
  • 192.193.83.0/24 (256 addresses (/24 prefix))
  • 156.154.92.0/24 (256 addresses (/24 prefix))
  • 156.154.118.0/24 (256 addresses (/24 prefix))
  • 156.154.238.0/24 (256 addresses (/24 prefix))
  • 156.154.152.0/24 (256 addresses (/24 prefix))
  • 64.6.64.0/24 (256 addresses (/24 prefix))
  • 156.137.195.0/24 (256 addresses (/24 prefix))
  • 156.154.166.0/24 (256 addresses (/24 prefix))
  • 156.137.1.0/24 (256 addresses (/24 prefix))
  • 37.224.77.0/24 (256 addresses (/24 prefix))
  • 24.248.247.0/24 (256 addresses (/24 prefix))
  • 147.160.159.0/24 (256 addresses (/24 prefix))
  • 156.154.234.0/24 (256 addresses (/24 prefix))
  • 5.36.169.0/24 (256 addresses (/24 prefix))
  • 146.88.246.0/24 (256 addresses (/24 prefix))
  • 204.55.147.0/24 (256 addresses (/24 prefix))
  • 156.154.245.0/24 (256 addresses (/24 prefix))
  • 146.88.245.0/24 (256 addresses (/24 prefix))
  • 165.72.190.0/24 (256 addresses (/24 prefix))
  • 165.72.192.0/24 (256 addresses (/24 prefix))

IPv6 Prefixes (25 total)

  • 2610:a1:2000::/45
  • 2610:a1:2008::/46
  • 2610:a1:200c::/47
  • 2610:a1:200f::/48
  • 2403:c580:fffd::/48
  • 2403:c580:fff3::/48
  • 2001:67c:3e8::/48
  • 2610:a1:2016::/48
  • 2610:a1:201c::/48
  • 2610:a1:20ff::/48
  • 2620:1d6:fff3::/48
  • 2620:1d6:fffd::/48
  • 2a05:4a40:fff3::/48
  • 2a05:4a40:fffd::/48