Data as of Nov 9, 2026
198.133.21.0/24
No anonymizer space · no proxy exits in 30 daysAT&T Enterprises, LLC
Registrations in this block
The registry's network records over this block, widest first, each under its parent.
| Range | Addresses | Netname | Holder | Type | Created | Abuse contact |
|---|---|---|---|---|---|---|
| 198.133.16.0/20 | 4,096 | ATT-198-133-16-0-C | AT&T Enterprises, LLC (AEL-360) · US | Direct Allocation | Apr 22, 1993 | abuse@ |
| └ 198.133.21.0/24 | 256 | IBM-HPCC6 | unknown | — | — | — |
Network & registry
Announced by
Covering announcement 198.133.16.0/20
- Prefix
- 198.133.16.0/20
- Announced by
- AS7018 AT&T Enterprises, LLC
- Type
- Residential
- RPKI
- RPKI valid
- Netname
- ATT-198-133-16-0-C
- Registrant
- AT&T Enterprises, LLC
- RIR
- ARIN
Origin network
AS7018
US
- Name
- AT&T Enterprises, LLC
- Type
- Internet provider
- Registered
- Jul 30, 1996
- Domain
- att.com
- Website
- www.att.com
- Industry
- Internet Service Provider (ISP)
- Spamhaus ASN-DROP
- not listed
Routing timeline
Who has announced 198.133.16.0/20
198.133.16.0/20
Routing history
- Pattern
- Stable
- First seen
- May 2005
- Current origin since
- May 2005 · 22 yr
- Origin networks
- 1
RPKI
Route origin authorizations
| ROA prefix | ASN | Max len | Anchor | Verdict |
|---|---|---|---|---|
| 198.133.16.0/20 | AS7018 | /20 | ARIN | RPKI valid |
Whois
Registration for this announcement
- Range
- 198.
133. 16. 0/ 20 - Netname
- ATT-198-133-16-0-C
- Registrant
- AT&T Enterprises, LLC
- Organization
- AT&T Enterprises, LLC (AEL-360)
- Org address
- 208 S. Akard St., Dallas, TX, 75202
- Org country
- US
- Type
- Direct Allocation
- Handle
- NET-198-133-16-0-1
- Parent
- NET-198-0-0-0-0
- Created
- Apr 22, 1993
- RIR
- ARIN
- Country
- US
- Delegated
- Apr 22, 1993
- Status
- assigned
Report abuse
Abuse contact
- abuse@
att. net - Name
- abuse
- Phone
- +1-919-319-8167
- Handle
- ABUSE7-ARIN