Data as of Nov 9, 2026
144.121.104.0/22
No anonymizer space · no proxy exits in 30 daysCrown Castle Fiber LLC · space held by Zayo Bandwidth
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | Proxy exits | Holder | RPKI |
|---|---|---|---|---|---|
| 144.121.64.0/18 since May 2016 | AS46887 | Internet provider | 35 8 always on | Zayo Bandwidth | |
| 144.121.0.0/16 since Nov 2021 | AS46887 | Internet provider | 129 25 always on | Zayo Bandwidth |
More specific
Announcements inside
| Prefix | Origin | Type | Holder | RPKI |
|---|---|---|---|---|
| 144.121.104.0/24 since May 2017 | AS21821 | Business | Zayo Bandwidth | |
| 144.121.107.0/24 since Mar 2020 | AS7046 | Business | 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.
| Range | Addresses | Netname | Holder | Type | Created | Abuse contact |
|---|---|---|---|---|---|---|
| 144.121.0.0/16 | 65,536 | ZAYO-CCF-144-121-0-0 | Zayo Bandwidth (ZAYOB) · US | Direct Allocation | Apr 29, 2016 | abuse@ |
| └ 144.121.104.0/24 | 256 | NET-144-121-104-0-24 | Montefiore Medicine Academic Health System, Inc. (C06335790) · US | Reassigned | Feb 15, 2017 | abuse@ via ZAYO-CCF-144-121-0-0 |
| └ 144.121.105.0/30 | 4 | NET-CCF---144-121-105-0-30 | unknown | — | — | — |
| └ 144.121.105.12/30 | 4 | NET-CCF--0-144-121-105-12-30 | unknown | — | — | — |
| └ 144.121.105.36/30 | 4 | NET-CCF---144-121-105-36-30 | unknown | — | — | — |
| └ 144.121.105.40/29 | 8 | NET-Z-CCF-SD-50094-144-121-105-40-29 | unknown | — | — | — |
| └ 144.121.105.56/29 | 8 | NET-CCF-LT-652-144-121-105-56-29 | unknown | — | — | — |
| └ 144.121.105.64/28 | 16 | NET-CCF-144-121-105-64-28 | unknown | — | — | — |
| └ 144.121.105.88/29 | 8 | NET-CCF-0-144-121-105-88-29 | unknown | — | — | — |
| └ 144.121.105.100/30 | 4 | NET-CCF---144-121-105-100-30 | unknown | — | — | — |
| └ 144.121.105.104/29 | 8 | NET-CCF---144-121-105-104-29 | unknown | — | — | — |
| └ 144.121.105.112/28 | 16 | NET-CCF--144-121-105-112-28 | unknown | — | — | — |
| └ 144.121.105.128/26 | 64 | NET-144-121-105-128-26 | unknown | — | — | — |
| └ 144.121.105.204/30 | 4 | NET-CCF--0-144-121-105-204-30 | unknown | — | — | — |
| └ 144.121.105.208/28 | 16 | NET-Z-CCF-0-144-121-105-208-28 | unknown | — | — | — |
| └ 144.121.105.228/30 | 4 | NET-CCF--0-144-121-105-228-30 | unknown | — | — | — |
| └ 144.121.105.232/29 | 8 | NET-CCF--144-121-105-232-29 | unknown | — | — | — |
| └ 144.121.105.240/29 | 8 | NET-CCF---144-121-105-240-29 | unknown | — | — | — |
| └ 144.121.105.248/29 | 8 | NET-CCF-0-144-121-105-248-29 | unknown | — | — | — |
| └ 144.121.106.0/29 | 8 | NET-Z-CCF--144-121-106-0-29 | unknown | — | — | — |
| └ 144.121.106.8/29 | 8 | NET-CCF---144-121-106-8-29 | unknown | — | — | — |
| └ 144.121.106.16/29 | 8 | NET-CCF---144-121-106-16-29 | unknown | — | — | — |
| └ 144.121.106.32/30 | 4 | NET-CCF--144-121-106-32-30 | unknown | — | — | — |
| └ 144.121.106.48/28 | 16 | NET-CCF--144-121-106-48-28 | unknown | — | — | — |
| └ 144.121.106.64/28 | 16 | NET-144-121-106-64-28 | unknown | — | — | — |
| └ 144.121.106.80/29 | 8 | NET-CCF---144-121-106-80-29 | unknown | — | — | — |
| └ 144.121.106.88/29 | 8 | LTF--144-121-106-88-29 | unknown | — | — | — |
| └ 144.121.106.96/30 | 4 | NET-CCF-0-144-121-106-96-30 | unknown | — | — | — |
| └ 144.121.106.100/30 | 4 | NET-CCF--0-144-121-106-100-30 | unknown | — | — | — |
| └ 144.121.106.104/29 | 8 | NET-CCF---144-121-106-104-29 | unknown | — | — | — |
| └ 144.121.106.112/28 | 16 | NET-CCF-0-144-121-106-112-28 | unknown | — | — | — |
| └ 144.121.106.128/27 | 32 | NET-144-121-106-128-27 | unknown | — | — | — |
| └ 144.121.106.168/30 | 4 | NET-CCF---144-121-106-168-30 | unknown | — | — | — |
| └ 144.121.106.180/30 | 4 | NET-CCF---144-121-106-180-30 | unknown | — | — | — |
| └ 144.121.106.184/29 | 8 | NET-CCF---144-121-106-184-29 | unknown | — | — | — |
| └ 144.121.106.192/29 | 8 | NET-CCF--144-121-106-192-29 | unknown | — | — | — |
| └ 144.121.106.200/29 | 8 | NET-CCF--144-121-106-200-29 | unknown | — | — | — |
| └ 144.121.106.208/29 | 8 | NET-CCF--144-121-106-208-29 | unknown | — | — | — |
| └ 144.121.106.216/29 | 8 | NET-CCF--144-121-106-216-29 | unknown | — | — | — |
| └ 144.121.106.224/29 | 8 | NET-CCF--144-121-106-224-29 | unknown | — | — | — |
| └ 144.121.106.232/29 | 8 | NET-CCF--0-144-121-106-232-29 | unknown | — | — | — |
| └ 144.121.106.240/30 | 4 | NET-CCF---144-121-106-240-30 | unknown | — | — | — |
| └ 144.121.106.248/29 | 8 | NET-CCF-0-144-121-106-248-29 | unknown | — | — | — |
| └ 144.121.107.0/24 | 256 | NET-144-121-107-0-24 | New Jersey Schools Development Authority ( NJSDA ) (C07443159) · US | Reassigned | Oct 21, 2019 | abuse@ via ZAYO-CCF-144-121-0-0 |
A contact marked “via” is the registry's: the record names none of its own, so the registry hands down its parent's.
Composition
The types across the prefix's announced space, by addresses.
Announced space
Address share
Announced space
Types across the prefix
1,024 addresses
| Type | Addresses | Share | Ranges | |
|---|---|---|---|---|
| Business | 512 | 50% | 2 | |
| Internet provider | 512 | 50% | 1 |
Network & registry
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
Routing timeline
Covering aggregate above, the prefix's own history below
Summary
Routing history
- Pattern
- Stable
- First seen
- Aug 2025
- Current origin since
- Aug 2025 · 1.3 yr
- Origin networks
- 1
IRR
Route objects on the exact prefix
| Origin | Registry | Description | Maintainer | Modified |
|---|---|---|---|---|
| AS46887 | RADB | MAINT-AS27506 | Sep 3, 2025 |
Whois
Registration for this announcement
- Range
- 144.
121. 0. 0/ 16 - Netname
- ZAYO-CCF-144-121-0-0
- Registrant
- Zayo Bandwidth
- Organization
- Zayo Bandwidth (ZAYOB)
- Org address
- 1401 Wynkoop St., Denver, CO, 80202
- Org country
- US
- Type
- Direct Allocation
- Handle
- NET-144-121-0-0-1
- Parent
- NET-144-0-0-0-0
- Created
- Apr 29, 2016
- RIR
- ARIN
- Country
- US
- Delegated
- Apr 29, 2016
- Status
- assigned
Report abuse
Abuse contact
- abuse@
zayo. com - Name
- Abuse
- Phone
- +1-866-236-2824
- Handle
- ABUSE5675-ARIN