Data as of Nov 11, 2026
12.205.97.0/24
No anonymizer space · no proxy exits in 30 daysSistema Universitario Ana G. Mendez · space held by AT&T Enterprises, LLC
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | Leased from | Proxy exits | Holder | RPKI |
|---|---|---|---|---|---|---|
| 12.205.96.0/20 since Jan 2025 | AS11992 | Mobile | AT&T Enterprises, LLC via AT&T Services, Inc. | |||
| 12.128.0.0/9 | AS7018 | Residential | IP broker Rackdog (part) | 5,309 237 always on | AT&T Enterprises, LLC | |
| 12.0.0.0/8 | AS7018 | Residential | 13,428 538 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@ |
| └ 12.205.0.0/16 | 65,536 | ATTWORLD27 | AT&T Services, Inc. (ATTW) · US | Reallocated | Jul 6, 2010 | — |
| └ 12.205.64.0/18 | 16,384 | ATT-NET-12-205-64-0-18 | Liberty Mobile Puerto Rico Inc. (LMPR) · PR | Reassigned | Sep 23, 2025 | noc@ |
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
- AT&T Services, Inc. (ATTW)
- Reallocated range
- 12.
205. 0. 0/ 16 - Reallocated
- Jul 6, 2010
Origin network
AS22888
PR
- Name
- Sistema Universitario Ana G. Mendez
- Type
- Education
- Registered
- Dec 10, 2001
- Domain
- uagm.edu
- Industry
- Colleges, Universities, and Professional Schools
- Spamhaus ASN-DROP
- not listed
Routing timeline
Covering aggregate above, the prefix's own history below
Summary
Routing history
- Pattern
- Stable
- First seen
- Dec 2013
- Current origin since
- Sep 2016 · 10 yr
- Origin networks
- 1
Whois
Registration for this announcement
- Range
- 12.
205. 64. 0/ 18 - Netname
- ATT-NET-12-205-64-0-18
- Registrant
- Liberty Mobile Puerto Rico Inc.
- Organization
- Liberty Mobile Puerto Rico Inc. (LMPR)
- Org address
- 279 Ponce de Leon Ave., San Juan, PR, 00918
- Org country
- PR
- Type
- Reassigned
- Handle
- NET-12-205-64-0-1
- Parent
- NET-12-205-0-0-1
- Created
- Sep 23, 2025
- RIR
- ARIN
- Country
- US
- Delegated
- Aug 23, 1983
- Status
- assigned
Report abuse
Abuse contact
- noc@
libertypr. com - Name
- LIBERTY NOC
- Phone
- +1-787-444-0580
- Handle
- LIBER1-ARIN