AS51572 — CERULEAN Cerulean Solutions Limited

AS51572 announces 1 IPv4 prefixes covering 2,048 addresses and 0 IPv6 prefixes.

About this network

The AS handle CERULEAN is held by Cerulean Solutions Limited.

What it's used for

• The address space carries a single IPv4 block, 46.16.80.0/21, with the netname UK-CERULEAN-20100930 and registrant Cerulean Solutions Limited.
• The network announces 2048 IPv4 addresses across 1 prefix and maintains 1 observed neighbour, a ratio consistent with a small, self-contained corporate estate rather than a transit or large access network.
• As an IT support and managed services provider operating in London and South East England, the traffic from this AS consists of office workers, web/API endpoints, and internal business applications.

Notable

• The RDAP registrant Cerulean Solutions Limited matches the AS holder, confirming direct ownership of the announced space.
• The inventory consists of a single contiguous /21 block, indicating a straightforward internal corporate allocation without complex subdivision or multi-site segmentation.

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

Announced prefixes

• 46.16.80.0/21

Upstream networks

• AS25577 MAINFRAME & CYBERNETIC SYSTEMS LIMITED

Adjacent networks

• AS25577 MAINFRAME & CYBERNETIC SYSTEMS LIMITED

Routing security

• RPKI: 0 valid, 0 invalid and 1 not-found announcements; 0 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 1 route objects.
• Listed in as-sets: AS-C4L.