Data as of Nov 8, 2026
144.121.43.0/24
No anonymizer space · no proxy exits in 30 daysMobile Heartbeat · space held by Zayo Bandwidth
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | Proxy exits | Holder | RPKI |
|---|---|---|---|---|---|
| 144.121.0.0/18 since Aug 2016 | AS46887 | Internet provider | 16 3 always on | Zayo Bandwidth | |
| 144.121.0.0/16 since Nov 2021 | AS46887 | Internet provider | 131 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.
| 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@ |
| └ 144.121.43.0/24 | 256 | NET-144-121-43-0-24 | Mobile Heartbeat (C06933171) · US | Reassigned | Mar 27, 2018 | 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.
Network & registry
Registry
Holder
- Organization
- Zayo Bandwidth
- Handle
- ZAYOB
- Range
- 144.
121. 0. 0/ 16 - Registration type
- Direct Allocation
- Record created
- Apr 29, 2016
Origin network
AS64293
US
- Name
- Mobile Heartbeat
- Type
- Business
- Registered
- Mar 19, 2018
- Domain
- mobileheartbeat.com
- Industry
- Phone Provider
- Spamhaus ASN-DROP
- not listed
Routing timeline
Covering aggregate above, the prefix's own history below
Summary
Routing history
- Pattern
- Stable
- First seen
- May 2018
- Current origin since
- May 2018 · 8.5 yr
- Origin networks
- 1
IRR
Route objects on the exact prefix
| Origin | Registry | Description | Maintainer | Modified |
|---|---|---|---|---|
| AS64293 | RADB | Comcast Cable Communications, Inc. | MAINT-AS7922 | Nov 13, 2023 |
Whois
Registration for this announcement
- Range
- 144.
121. 43. 0/ 24 - Netname
- NET-144-121-43-0-24
- Registrant
- Mobile Heartbeat
- Organization
- Mobile Heartbeat (C06933171)
- Type
- Reassigned
- Handle
- NET-144-121-43-0-1
- Parent
- NET-144-121-0-0-1
- Created
- Mar 27, 2018
- 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