Data as of Nov 8, 2026
12.204.200.0/24
No anonymizer space · no proxy exits in 30 daysThe University of Tennessee Health Science Center · space held by AT&T Enterprises, LLC
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | Leased from | Proxy exits | Holder | RPKI |
|---|---|---|---|---|---|---|
| 12.204.192.0/20 since Jun 2025 | AS19957 | Business | AT&T Enterprises, LLC | |||
| 12.128.0.0/9 | AS7018 | Residential | IP broker Rackdog (part) | 5,263 290 always on | AT&T Enterprises, LLC | |
| 12.0.0.0/8 | AS7018 | Residential | 13,346 727 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@ |
| └ 12.204.192.0/20 | 4,096 | 12-204-192-0-20 | State of Tennessee-Nettn (ST-1700) · US | Reassigned | Feb 12, 2025 | — |
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
Origin network
AS16989
US
- Name
- The University of Tennessee Health Science Center
- Type
- Education
- Registered
- Jul 11, 2000
- Domain
- uthsc.edu
- Website
- www.uthsc.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
- Rotating
- First seen
- Sep 2009
- Current origin since
- Dec 2025 · 11 mo
- Origin networks
- 2
- Last change of origin
- Dec 2025
Recorded history
History
- Handoffs
- 1
Whois
Registration for this announcement
- Range
- 12.
204. 192. 0/ 20 - Netname
- 12-204-192-0-20
- Registrant
- State of Tennessee-Nettn
- Organization
- State of Tennessee-Nettn (ST-1700)
- Org address
- 333 Commerce Street, Nashville, TN, 37201
- Org country
- US
- Type
- Reassigned
- Handle
- NET-12-204-192-0-1
- Parent
- NET-12-0-0-0-1
- Created
- Feb 12, 2025
- 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