AS203833 AT-FIRSTCOLO firstcolo GmbH

AT-FIRSTCOLO firstcolo GmbH · registered in Germany

IPv4 addresses2,8167 prefixes · <0.001% of announced IPv4

Rank in Germany#726largest network in DE by IPv4 space, of 2,315 · <0.01% of DE

Rank worldwide#19,323of 79,396 networks with IPv4

IPv61 x /481 prefixes

CountryGermany2,599 ASNs registered there

Open AS203833 in ASN lookup Look up an IP in this network (5.187.28.1) All networks in Germany

IPv4 prefixes

All 7 prefixes, in address order.

5.187.28.0/24
79.133.32.0/23
79.133.43.0/24
109.169.80.0/24
159.100.24.0/22
168.81.255.0/24
196.18.175.0/24

IPv6 prefixes

All 1 prefix.

2a00:11c0:38::/48

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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