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Data as of Nov 3, 2026

63.71.8.0/21

No anonymizer space · no proxy exits in 30 days

Zix Corporation · space held by Verizon Business

Announcement
this exact prefix
No RPKI
Announced by
AS13380
Type
Hosting
Risk
50 / 100 · Medium

Announcements

Less specific

Covering announcements

PrefixOriginTypeProxy exitsHolderRPKI
63.64.0.0/12AS701Internet provider323
44 always on
Verizon Business

Registrations in this block

The registry's network records over the announcement: those covering it, widest first, then every record inside it, under its parent.

RangeAddressesNetnameHolderTypeCreatedAbuse contact
63.64.0.0/104,194,304UUNET63Verizon Business (MCICS) · USDirect AllocationJan 22, 1999[email protected]
└ 63.71.8.0/212,048VZ-63-71-8-0Zix Corp (C07373879) · USReassignedJun 21, 2019[email protected]
via UUNET63

A contact marked “via” is the registry's: the record names none of its own, so the registry hands down its parent's.

Network & registry

AnnouncementRouting historyRPKI & IRRWhois & abuse
IPv4 market

Holder

Holder in the market →
Organization
Verizon Business
Handle
MCICS
Range
63.64.0.0/10
Registration type
Direct Allocation
Record created
Jan 22, 1999
Origin network

AS13380

US
Name
Zix Corporation
Type
Business
Registered
May 25, 1999
Domain
zixcorp.com
Industry
Hosting and Cloud Provider
Spamhaus ASN-DROP
not listed