Data as of Nov 11, 2026
12.5.187.0/24
No anonymizer space · no proxy exits in 30 daysCisco Systems, Inc. · space held by AT&T Enterprises, LLC
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | Proxy exits | Holder | RPKI |
|---|---|---|---|---|---|
| 12.0.0.0/9 | AS7018 | Residential | 8,119 301 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 this block, widest first, each 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@ |
| └ 12.5.186.0/23 | 512 | CISCO-SY146-186 | Cisco Systems, Inc (C11536465) · US | Reassigned | Mar 9, 2026 | abuse@ via ATT |
A contact marked “via” is the registry's: the record names none of its own, so the registry hands down its parent's.
Network & registry
Announced by
Covering announcement 12.5.186.0/23
- Prefix
- 12.5.186.0/23
- Announced by
- AS109 Cisco Systems, Inc.
- Type
- Business
- RPKI
- No RPKI
- Netname
- CISCO-SY146-186
- Registrant
- Cisco Systems, Inc
- RIR
- ARIN
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
AS109
US
- Name
- Cisco Systems, Inc.
- Type
- Business
- Registered
- May 6, 1987
- Domain
- cisco.com
- Website
- www.cisco.com
- Industry
- Computer and Information Technology
- Spamhaus ASN-DROP
- not listed
Routing timeline
Covering aggregate above, the prefix's own history below
12.5.186.0/23
Routing history
- Pattern
- Stable
- First seen
- May 2005
- Current origin since
- Mar 2006 · 21 yr
- Origin networks
- 2
- Last change of origin
- Mar 2006
Recorded history
History
- Handoffs
- 1
Whois
Registration for this announcement
- Range
- 12.
5. 186. 0/ 23 - Netname
- CISCO-SY146-186
- Registrant
- Cisco Systems, Inc
- Organization
- Cisco Systems, Inc (C11536465)
- Type
- Reassigned
- Handle
- NET-12-5-186-0-1
- Parent
- NET-12-0-0-0-1
- Created
- Mar 9, 2026
- 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