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Data as of Nov 7, 2026

144.121.4.0/22

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 provider17
3 always on
Zayo Bandwidth
144.121.0.0/16
since Nov 2021
AS46887Internet provider134
24 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
└ 144.121.4.0/24256NET-144-121-4-0-24unknown———
└ 144.121.5.0/304NET-CCF--LT-524-144-121-5-0-30unknown———
└ 144.121.5.4/304NET-CCF---144-121-5-4-30unknown———
└ 144.121.5.8/304NET-Z-CCF--144-121-5-8-30unknown———
└ 144.121.5.16/2816NET-CCF--0-144-121-5-16-28unknown———
└ 144.121.5.32/298LTF-0-144-121-5-32-29unknown———
└ 144.121.5.48/298NET-144-121-5-48-29unknown———
└ 144.121.5.56/298NET-144-121-5-56-29unknown———
└ 144.121.5.64/298NET-144-121-5-64-29unknown———
└ 144.121.5.72/298NET-144-121-5-72-29unknown———
└ 144.121.5.80/298NET-CCF--0-144-121-5-80-29unknown———
└ 144.121.5.88/298NET-144-121-5-88-29unknown———
└ 144.121.5.96/2732NET-144-121-5-96-27unknown———
└ 144.121.5.128/298NET-144-121-5-128-29unknown———
└ 144.121.5.136/304NET-CCF--144-121-5-136-30unknown———
└ 144.121.5.140/304NET-CCF---144-121-5-140-30unknown———
└ 144.121.5.144/298NET-CCF--0-144-121-5-144-29unknown———
└ 144.121.5.152/298NET-144-121-5-152-29unknown———
└ 144.121.5.160/2732NET-144-121-5-160-27unknown———
└ 144.121.5.196/304NET-CCF---144-121-5-196-30unknown———
└ 144.121.5.200/298NET-144-121-5-200-29unknown———
└ 144.121.5.208/298LTF--144-121-5-208-29unknown———
└ 144.121.5.224/304NET-CCF--0-144-121-5-224-30unknown———
└ 144.121.5.232/304NET-Z-CCF-0-144-121-5-232-30unknown———
└ 144.121.5.240/298LTF--144-121-5-240-29unknown———
└ 144.121.5.248/298NET-CCF---144-121-5-248-29unknown———
└ 144.121.6.8/298LTF-0-144-121-6-8-29unknown———
└ 144.121.6.16/304NET-CCF-0-144-121-6-16-30unknown———
└ 144.121.6.20/304NET-CCF--144-121-6-20-30unknown———
└ 144.121.6.24/298NET-144-121-6-24-29unknown———
└ 144.121.6.40/298NET-CCF---144-121-6-40-29unknown———
└ 144.121.6.64/298NET-CCF---144-121-6-64-29unknown———
└ 144.121.6.72/298NET-CCF---144-121-6-72-29unknown———
└ 144.121.6.96/2732NET-144-121-6-96-27unknown———
└ 144.121.6.128/2664NET-CCF--LT-524-144-121-6-128-26unknown———
└ 144.121.6.192/2816LTF--144-121-6-192-28unknown———
└ 144.121.6.232/298LTF-LT-614-144-121-6-232-29unknown———
└ 144.121.6.240/298LTF--144-121-6-240-29unknown———
└ 144.121.6.248/298NET-Z-CCF-0-144-121-6-248-29unknown———
└ 144.121.7.0/2816NET-Z-CCF-0-144-121-7-0-28unknown———
└ 144.121.7.16/298NET-CCF-0-144-121-7-16-29unknown———
└ 144.121.7.24/298NET-CCF-SD-50960-144-121-7-24-29unknown———
└ 144.121.7.32/304NET-Z-CCF--144-121-7-32-30unknown———
└ 144.121.7.48/298NET-144-121-7-48-29unknown———
└ 144.121.7.56/298NET-CCF---144-121-7-56-29unknown———
└ 144.121.7.64/298NET-144-121-7-64-29unknown———
└ 144.121.7.76/304NET-CCF-0-144-121-7-76-30unknown———
└ 144.121.7.80/298NET-144-121-7-80-29unknown———
└ 144.121.7.104/298NET-CCF--0-144-121-7-104-29unknown———
└ 144.121.7.112/298NET-144-121-7-112-29unknown———
└ 144.121.7.120/298NET-CCF-0-144-121-7-120-29unknown———
└ 144.121.7.128/2664NET-144-121-7-128-26unknown———
└ 144.121.7.192/304NET-CCF--0-144-121-7-192-30unknown———
└ 144.121.7.196/304NET-CCF--0-144-121-7-196-30unknown———
└ 144.121.7.200/298NET-CCF---144-121-7-200-29unknown———
└ 144.121.7.208/298NET-144-121-7-208-29unknown———
└ 144.121.7.216/298NET-144-121-7-216-29unknown———
└ 144.121.7.228/304NET-0-144-121-7-228-30unknown———
└ 144.121.7.232/304NET-CCF--0-144-121-7-232-30unknown———
└ 144.121.7.236/304NET-CCF--144-121-7-236-30unknown———
└ 144.121.7.240/298LTF--144-121-7-240-29unknown———
└ 144.121.7.252/304NET-CCF--144-121-7-252-30unknown———

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