Data as of Nov 14, 2026
204.181.158.0/24
No anonymizer space · no proxy exits in 30 daysComputer Systems Design Company · space held by Cogent Communications, LLC
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | Holder | RPKI |
|---|---|---|---|---|
| 204.180.0.0/14 since May 2024 | AS174 | Internet provider | Cogent Communications, 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 |
|---|---|---|---|---|---|---|
| 204.180.0.0/14 | 262,144 | COGENT-204-180-0 | Cogent Communications, LLC (COGC) · US | Direct Allocation | Oct 18, 1994 | abuse@ |
| └ 204.181.152.0/21 | 2,048 | SPRINT-CCB59F | Computer Systems Design Company (CSD) · US | Reassigned | Dec 20, 1994 | john. |
Network & registry
Announced by
Covering announcement 204.181.152.0/21
- Prefix
- 204.181.152.0/21
- Announced by
- AS3364 Computer Systems Design Company
- Type
- Business
- RPKI
- No RPKI
- Netname
- SPRINT-CCB59F
- Registrant
- Computer Systems Design Company
- RIR
- ARIN
IPv4 market
Holder
- Organization
- Cogent Communications, LLC
- Handle
- COGC
- Range
- 204.
180. 0. 0/ 14 - Registration type
- Direct Allocation
- Record created
- Oct 18, 1994
- Legacy
- yes
Origin network
AS3364
US
- Name
- Computer Systems Design Company
- Type
- Business
- Registered
- Dec 30, 1993
- Domain
- csdco.com
- Industry
- Other
- Spamhaus ASN-DROP
- not listed
Routing timeline
Covering aggregate above, the prefix's own history below
204.181.152.0/21
Routing history
- Pattern
- Stable
- First seen
- Jan 2014
- Current origin since
- Jan 2014 · 13 yr
- Origin networks
- 1
Whois
Registration for this announcement
- Range
- 204.
181. 152. 0/ 21 - Netname
- SPRINT-CCB59F
- Registrant
- Computer Systems Design Company
- Organization
- Computer Systems Design Company (CSD)
- Org address
- 735 Highland Avenue, Boulder, CO, 80302
- Org country
- US
- Type
- Reassigned
- Handle
- NET-204-181-152-0-1
- Parent
- NET-204-180-0-0-1
- Created
- Dec 20, 1994
- RIR
- ARIN
- Country
- US
- Delegated
- Oct 18, 1994
- Status
- assigned
Report abuse
Abuse contact
- john.
nebel@ csd. net - Name
- Nebel, John
- Phone
- +1-303-447-8025
- Handle
- JN20-ARIN