AS15721 CTCO C.T.CO. Ltd.

CTCO C.T.CO. Ltd. · registered in Latvia

IPv4 addresses2,0481 prefixes · <0.001% of announced IPv4

Rank in Latvia#46largest network in LV by IPv4 space, of 249 · 0.12% of LV

Rank worldwide#22,877of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryLatvia255 ASNs registered there

Open AS15721 in ASN lookup Look up an IP in this network (217.21.168.1) All networks in Latvia

IPv4 prefixes

All 1 prefix, in address order.

217.21.168.0/21

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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