AS36321 — CSTL

AS36321 announces 5 IPv4 prefixes covering 1,792 addresses and 1 IPv6 prefixes.

About this network

The AS handle CSTL is held by Castle Global Inc.

What it's used for

• The address space carries corporate infrastructure, evidenced by netnames such as CSTL-EAST, CASTLE-WEST, CASTLE-SW, and CASTLE-WEST-2.
• The inventory consists of 1792 IPv4 addresses across 5 prefixes and 1 IPv6 prefix, with only 3 observed neighbours, indicating a small-scale internal corporate estate rather than a transit or access network.

Notable

• Registrants for all announced prefixes are consistent with the announcer, listing "Castle Global Inc." or "Castle Global".
• Castle Global Inc. is the corporate entity behind Hive Work, a platform for remote work and data collection services.
• The address inventory is finely subdivided into regional blocks (East, West, SW), reflecting site-by-site segmentation for an internal corporate network.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 64.124.8.0/24
• 66.187.0.0/23
• 74.80.208.0/24
• 199.83.232.0/23
• 199.184.214.0/24
• 2620:4e:e000::/48

Upstream networks

• AS6461 Zayo Bandwidth
• AS11404 Wave Broadband
• AS174 Cogent Communications, LLC

Adjacent networks

• AS6461 Zayo Bandwidth
• AS11404 Wave Broadband
• AS174 Cogent Communications, LLC

Routing security

• RPKI: 6 valid, 0 invalid and 0 not-found announcements; 7 ROAs.
• ASPA: none published.
• IRR: 83% of announcements registered; 11 route objects.
• Listed in as-sets: AS-PNAPSFO, AS-WAVE-CUSTOMERS, AS-XO-B.