Whois
Various Registries (Maintained by ARIN) NET166 (NET-166-0-0-0-0) 166.0.0.0 - 166.255.255.255
Verizon Business MCI-NETCS3 (NET-166-32-0-0-1) 166.32.0.0 - 166.40.255.255
CIDR IP address subranges within 166.37.0.0/18 subnet
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