AS51257 — CERIZ

AS51257 announces 1 IPv4 prefixes covering 256 addresses and 1 IPv6 prefixes.

About this network

The AS handle CERIZ is held by CERIZ SASU.

What it's used for

• The address space carries enterprise traffic, identified by the netname FR-CERIZ-20190131 and registrant CERIZ SASU.
• The network announces 256 IPv4 addresses and 20 IPv6 prefixes, with a single observed neighbour, indicating a small-scale internal corporate estate rather than a transit or access provider.
• Traffic from this AS consists of office workers and internal business endpoints for the CERIZ organization.

Notable

• The registrant CERIZ SASU agrees with the announcer, confirming a direct ownership relationship.
• The address inventory is compact, consisting of a single IPv4 /24 block and a set of IPv6 prefixes under the 2a05:d80::/34 range.

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

Announced prefixes

• 171.22.146.0/24
• 2a05:d80::/29

Upstream networks

• AS29075 IELO-LIAZO SERVICES SAS

Adjacent networks

• AS29075 IELO-LIAZO SERVICES SAS

Routing security

• RPKI: 3 valid, 0 invalid and 0 not-found announcements; 3 ROAs.
• ASPA: none published.
• IRR: 67% of announcements registered; 2 route objects.
• Listed in as-sets: AS-CERIZ, AS-HURRICANEV6, AS-TELICITY-PEERING-FRANCE-IX, AS29075:AS-CUSTOMERS.