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166.4.0.0/14 is not visible in the global routing table.

Less Specific Announcements
OriginOrigin RegistrantPrefixPrefix Registrant
AS7018 AT&T Enterprises, LLC 166.0.0.0/13 Various Registries (Maintained by ARIN)
Matching Delegations
RegistryStatusPrefixCC
arin allocated 166.4.0.0/14 US United States