AS43037 SEZNAM-CZ Seznam.cz, a.s.

SEZNAM-CZ Seznam.cz, a.s. · registered in Czechia

IPv4 addresses3,0722 prefixes · <0.001% of announced IPv4

Rank in Czechia#159largest network in CZ by IPv4 space, of 570 · 0.04% of CZ

Rank worldwide#18,069of 79,396 networks with IPv4

IPv61 x /32 (65,536 x /48)42 prefixes

CountryCzechia599 ASNs registered there

Open AS43037 in ASN lookup Look up an IP in this network (77.75.72.1) All networks in Czechia

IPv4 prefixes

All 2 prefixes, in address order.

77.75.72.0/21
185.66.188.0/22

IPv6 prefixes

All 42 prefixes.

2a02:598::/47
2a02:598:2::/48
2a02:598:3::/48
2a02:598:4::/46
2a02:598:8::/45
2a02:598:10::/44
2a02:598:20::/43
2a02:598:40::/42
2a02:598:80::/41
2a02:598:100::/40
2a02:598:200::/39
2a02:598:400::/38
2a02:598:800::/37
2a02:598:1000::/36
2a02:598:2000::/36
2a02:598:3000::/39
2a02:598:3200::/40
2a02:598:3300::/43
2a02:598:3320::/44
2a02:598:3330::/46
2a02:598:3334::/46
2a02:598:3338::/45
2a02:598:3340::/42
2a02:598:3380::/41
2a02:598:3400::/38
2a02:598:3800::/37
2a02:598:4000::/38
2a02:598:4400::/42
2a02:598:4440::/46
2a02:598:4444::/48
2a02:598:4445::/48
2a02:598:4446::/47
2a02:598:4448::/45
2a02:598:4450::/44
2a02:598:4460::/43
2a02:598:4480::/41
2a02:598:4500::/40
2a02:598:4600::/39
2a02:598:4800::/37
2a02:598:5000::/36
2a02:598:6000::/35
2a02:598:8000::/33

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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