Data as of Nov 13, 2026
209.186.72.0/21
512 anonymizer addresses · 25% · Datacenter proxyAT&T Enterprises, LLC
IPv4 market
Path
4 · Use
Residential
anonymizer space, operator not named
Operators, sellers and brokers
Leased from
Owners leasing their own space
| Name | In 209.186.72.0/21 | /24s |
|---|---|---|
| AT&T Enterprises, LLC | 51225% | 2 |
Announcements
More specific
Announcements inside
| Prefix | Origin | Type | Holder | RPKI |
|---|---|---|---|---|
| 209.186.78.0/24 since Aug 2025 | AS214760 | Datacenter proxy | AT&T Enterprises, LLC | |
| 209.186.79.0/24 since Aug 2025 | AS214760 | Datacenter proxy | AT&T Enterprises, LLC |
Composition
The types across the prefix's announced space, by addresses.
Announced space
Address share
Announced space
Types across the prefix
2,048 addresses
| Type | Addresses | Share | Ranges | |
|---|---|---|---|---|
| Residential | 1,536 | 75% | 1 | |
| Datacenter proxyanonymizer | 512 | 25% | 2 |
Network & registry
Announced by
Covering announcement 209.186.0.0/15
- Prefix
- 209.186.0.0/15
- Announced by
- AS7018 AT&T Enterprises, LLC
- Type
- Residential
- Anonymizer addresses
- none
- RPKI
- No RPKI
- Netname
- CERFNET-BLK-3
- 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 209.186.0.0/15
209.186.0.0/15
Routing history
- Pattern
- Stable
- First seen
- May 2005
- Current origin since
- May 2005 · 22 yr
- Origin networks
- 1
Whois
Registration for this announcement
- Range
- 209.
186. 0. 0/ 15 - Netname
- CERFNET-BLK-3
- 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-209-186-0-0-1
- Parent
- NET-209-0-0-0-0
- Created
- Dec 11, 1997
- RIR
- ARIN
- Country
- US
- Delegated
- Dec 11, 1997
- Status
- assigned
Report abuse
Abuse contact
- abuse@
att. net - Name
- abuse
- Phone
- +1-919-319-8167
- Handle
- ABUSE7-ARIN