Data as of Nov 4, 2026
12.129.82.0/24
No anonymizer space · no proxy exits in 30 daysMastec, Inc · space held by AT&T Enterprises, LLC
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | Leased from | Proxy exits | Holder | RPKI |
|---|---|---|---|---|---|---|
| 12.128.0.0/9 | AS7018 | Residential | IP broker Rackdog (part) | 5,173 283 always on | AT&T Enterprises, LLC | |
| 12.0.0.0/8 | AS7018 | Residential | 13,297 724 always on | AT&T Enterprises, LLC |
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 |
|---|---|---|---|---|---|---|
| 12.0.0.0/8 | 16,777,216 | ATT | AT&T Enterprises, LLC (AEL-360) · US | Direct Allocation | Aug 23, 1983 | abuse@ |
| └ 12.129.64.0/18 | 16,384 | ATTENS-ATL-1 | CERFnet (CERF) · US | Reallocated | Jan 30, 2002 | — |
Network & registry
IPv4 market
Holder
- Organization
- AT&T Enterprises, LLC
- Handle
- AEL-360
- Range
- 12.
0. 0. 0/ 8 - Registration type
- Direct Allocation
- Record created
- Aug 23, 1983
- Legacy
- yes
- Reallocated to
- CERFnet (CERF)
- Reallocated range
- 12.
129. 64. 0/ 18 - Reallocated
- Jan 30, 2002
Origin network
AS40631
US
- Name
- Mastec, Inc
- Type
- Business
- Registered
- Apr 15, 2011
- Domain
- mastec.com
- Industry
- Civil Engineering Construction (Utility Lines, Roads and Bridges)
- Spamhaus ASN-DROP
- not listed
Routing timeline
Covering aggregate above, the prefix's own history below
Summary
Routing history
- Pattern
- Stable
- First seen
- Jan 2018
- Current origin since
- Jun 2019 · 7.4 yr
- Origin networks
- 2
- Last change of origin
- Jun 2019
Recorded history
History
- Handoffs
- 1
Whois
Registration for this announcement
- Range
- 12.
129. 64. 0/ 18 - Netname
- ATTENS-ATL-1
- Registrant
- CERFnet
- Organization
- CERFnet (CERF)
- Org address
- 5738 Pacific Center Blvd, San Diego, CA, 92121
- Org country
- US
- Type
- Reallocated
- Handle
- NET-12-129-64-0-1
- Parent
- NET-12-0-0-0-1
- Created
- Jan 30, 2002
- RIR
- ARIN
- Country
- US
- Delegated
- Aug 23, 1983
- Status
- assigned
Report abuse
Abuse contact
- abuse@
att. net - Name
- abuse
- Phone
- +1-919-319-8167
- Handle
- ABUSE7-ARIN