AS61251 HOST4BIZ-AS Host4Biz sp. z o.o.

HOST4BIZ-AS Host4Biz sp. z o.o. · registered in Poland

IPv4 addresses2,8164 prefixes · <0.001% of announced IPv4

Rank in Poland#406largest network in PL by IPv4 space, of 2,091 · 0.01% of PL

Rank worldwide#19,134of 79,396 networks with IPv4

IPv68 x /32 (524,288 x /48)1 prefixes

CountryPoland2,145 ASNs registered there

Open AS61251 in ASN lookup Look up an IP in this network (77.73.36.1) All networks in Poland

IPv4 prefixes

All 4 prefixes, in address order.

77.73.36.0/22
91.195.12.0/23
91.232.127.0/24
185.151.244.0/22

IPv6 prefixes

All 1 prefix.

2a07:7c80::/29

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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