AS19577 CASTRO TELECOM LLC

CASTRO-TELECOM - CASTRO TELECOM LLC · registered in the United States

IPv4 addresses1,0241 prefixes · <0.001% of announced IPv4

Rank in United States#8,253largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#36,609of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryUnited States18,679 ASNs registered there

Open AS19577 in ASN lookup Look up an IP in this network (208.85.8.1) All networks in United States

IPv4 prefixes

All 1 prefix, in address order.

208.85.8.0/22

Other ASNs named CASTRO TELECOM LLC

1 other network uses the same organisation name; together with AS19577 they announce 2,304 IPv4 addresses.

ASNNameIPv4 addresses

AS33733CASTRO-TELECOM - CASTRO TELECOM LLC US1,280

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ASNNameIPv4 addresses

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AS19647#8255 HPINC - HP Inc.1,024

AS19761#8256 SLEDGE - Sledge Telephone Company1,024

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