AS51257 CERIZ CERIZ SASU

CERIZ CERIZ SASU · registered in France

IPv4 addresses2561 prefixes · <0.001% of announced IPv4

Rank in France#1,022largest network in FR by IPv4 space, of 1,375 · <0.01% of FR

Rank worldwide#58,808of 79,396 networks with IPv4

IPv68 x /32 (524,288 x /48)20 prefixes

CountryFrance1,474 ASNs registered there

Open AS51257 in ASN lookup Look up an IP in this network (171.22.146.1) All networks in France

IPv4 prefixes

All 1 prefix, in address order.

171.22.146.0/24

IPv6 prefixes

All 20 prefixes.

2a05:d80::/34
2a05:d80:4000::/48
2a05:d80:4001::/48
2a05:d80:4002::/47
2a05:d80:4004::/46
2a05:d80:4008::/45
2a05:d80:4010::/44
2a05:d80:4020::/43
2a05:d80:4040::/42
2a05:d80:4080::/41
2a05:d80:4100::/40
2a05:d80:4200::/39
2a05:d80:4400::/38
2a05:d80:4800::/37
2a05:d80:5000::/36
2a05:d80:6000::/35
2a05:d80:8000::/33
2a05:d81::/32
2a05:d82::/31
2a05:d84::/30

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IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources