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Data as of Nov 9, 2026

144.121.12.0/22

No anonymizer space · no proxy exits in 30 days

Crown Castle Fiber LLC · space held by Zayo Bandwidth

Announcement
this exact prefix
No RPKI
Announced by
AS46887
Type
Internet provider
Risk
0 / 100 · Low

Announcements

Less specific

Covering announcements

PrefixOriginTypeProxy exitsHolderRPKI
144.121.0.0/18
since Aug 2016
AS46887Internet provider16
3 always on
Zayo Bandwidth
144.121.0.0/16
since Nov 2021
AS46887Internet provider132
25 always on
Zayo Bandwidth

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
144.121.0.0/1665,536ZAYO-CCF-144-121-0-0Zayo Bandwidth (ZAYOB) · USDirect AllocationApr 29, 2016abuse@zayo.com
└ 144.121.12.0/2816NET-Z-CCF-0-144-121-12-0-28unknown———
└ 144.121.12.16/2816NET-Z-CCF-0-144-121-12-16-28unknown———
└ 144.121.12.32/2816NET-CCF--0-144-121-12-32-28unknown———
└ 144.121.12.48/2816NET-CCF--144-121-12-48-28unknown———
└ 144.121.12.64/2664NET-144-121-12-64-26unknown———
└ 144.121.12.128/304NET-CCF--0-144-121-12-128-30unknown———
└ 144.121.12.136/298NET-CCF---144-121-12-136-29unknown———
└ 144.121.12.144/2816NET-LT-450-144-121-12-144-28unknown———
└ 144.121.12.160/298NET-CCF--0-144-121-12-160-29unknown———
└ 144.121.12.168/298NET-CCF-0-144-121-12-168-29unknown———
└ 144.121.12.176/2816LTF--144-121-12-176-28unknown———
└ 144.121.12.208/298NET-CCF-0-144-121-12-208-29unknown———
└ 144.121.12.232/298NET-Z-CCF--144-121-12-232-29unknown———
└ 144.121.12.248/304NET-CCF---144-121-12-248-30unknown———
└ 144.121.13.0/2816NET-144-121-13-0-28unknown———
└ 144.121.13.16/298NET-CCF-LT-040-144-121-13-16-29unknown———
└ 144.121.13.40/298NET-CCF--144-121-13-40-29unknown———
└ 144.121.13.48/2816NET-144-121-13-48-28unknown———
└ 144.121.13.64/2732NET-144-121-13-64-27unknown———
└ 144.121.13.104/298NET-144-121-13-104-29unknown———
└ 144.121.13.160/304NET-CCF-0-144-121-13-160-30unknown———
└ 144.121.13.164/304NET-CCF--0-144-121-13-164-30unknown———
└ 144.121.13.176/2816NET-144-121-13-176-28unknown———
└ 144.121.13.192/298NET-Z-CCF--144-121-13-192-29unknown———
└ 144.121.13.208/298LTF--144-121-13-208-29unknown———
└ 144.121.13.216/298NET-CCF--144-121-13-216-29unknown———
└ 144.121.13.248/304NET-CCF--144-121-13-248-30unknown———
└ 144.121.13.252/304NET-CCF--144-121-13-252-30unknown———
└ 144.121.14.0/2732NET-144-121-14-0-27unknown———
└ 144.121.14.56/298NET-144-121-14-56-29unknown———
└ 144.121.14.68/304NET-144-121-14-68-30unknown———
└ 144.121.14.72/298NET-CCF--144-121-14-72-29unknown———
└ 144.121.14.88/298NET-CCF-0-144-121-14-88-29unknown———
└ 144.121.14.96/2732NET-LT-176-144-121-14-96-27unknown———
└ 144.121.14.128/2732NET-144-121-14-128-27unknown———
└ 144.121.14.160/2816NET-CCF---144-121-14-160-28unknown———
└ 144.121.14.176/304NET-CCF-0-144-121-14-176-30unknown———
└ 144.121.14.184/298NET-CCF-0-144-121-14-184-29unknown———
└ 144.121.14.192/298LTF--144-121-14-192-29unknown———
└ 144.121.14.200/298NET-144-121-14-200-29unknown———
└ 144.121.14.208/304NET-CCF--144-121-14-208-30unknown———
└ 144.121.14.212/304NET-CCF--144-121-14-212-30unknown———
└ 144.121.14.216/298NET-CCF--0-144-121-14-216-29unknown———
└ 144.121.14.232/298NET-144-121-14-232-29unknown———
└ 144.121.15.24/298NET-CCF--144-121-15-24-29unknown———
└ 144.121.15.32/2816NET-144-121-15-32-28unknown———
└ 144.121.15.48/304NET-Z-CCF-0-144-121-15-48-30unknown———
└ 144.121.15.56/298NET-Z-CCF--144-121-15-56-29unknown———
└ 144.121.15.64/2664NET-144-121-15-64-26unknown———
└ 144.121.15.128/2816NET-CCF--0-144-121-15-128-28unknown———
└ 144.121.15.144/298NET-CCF--144-121-15-144-29unknown———
└ 144.121.15.152/298LTF--144-121-15-152-29unknown———
└ 144.121.15.160/2816LTF--144-121-15-160-28unknown———
└ 144.121.15.176/298NET-CCF---144-121-15-176-29unknown———
└ 144.121.15.184/298LTF--144-121-15-184-29unknown———
└ 144.121.15.192/2816NET-144-121-15-192-28unknown———
└ 144.121.15.208/2816NET-CCF--0-144-121-15-208-28unknown———
└ 144.121.15.224/304NET-CCF--144-121-15-224-30unknown———
└ 144.121.15.228/304NET-Z-CCF--144-121-15-228-30unknown———
└ 144.121.15.232/298NET-CCF--0-144-121-15-232-29unknown———
└ 144.121.15.240/2816NET-CCF--0-144-121-15-240-28unknown———

Network & registry

AnnouncementRouting historyRPKI & IRRWhois & abuse
Origin network

AS46887

US
Name
Crown Castle Fiber LLC
Type
Internet provider
Registered
Apr 13, 2009
Domain
zayo.com
Website
www.crowncastle.com/
Industry
Internet Service Provider (ISP)
Spamhaus ASN-DROP
not listed