Data as of Nov 5, 2026
205.240.0.0/20
No anonymizer space · no proxy exits in 30 daysComputer Systems Design Company · reallocated from Cogent Communications, LLC
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | Proxy exits | Holder | RPKI |
|---|---|---|---|---|---|
| 205.240.0.0/13 | AS174 | Internet provider | 34 3 always on | Cogent Communications, 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 |
|---|---|---|---|---|---|---|
| 205.240.0.0/13 | 524,288 | COGENT-205-240-0 | Cogent Communications, LLC (COGC) · US | Direct Allocation | Apr 24, 1995 | abuse@ |
| └ 205.240.0.0/20 | 4,096 | SPRINT-CDF00F | Computer Systems Design Company (CSD) · US | Reallocated | Apr 25, 1995 | john. |
Network & registry
IPv4 market
Holder
- Organization
- Cogent Communications, LLC
- Handle
- COGC
- Range
- 205.
240. 0. 0/ 13 - Registration type
- Direct Allocation
- Record created
- Apr 24, 1995
- Legacy
- yes
- Reallocated to
- Computer Systems Design Company (CSD)
- Reallocated range
- 205.
240. 0. 0/ 20 - Reallocated
- Apr 25, 1995
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
Summary
Routing history
- Pattern
- Stable
- First seen
- Jan 2014
- Current origin since
- Jan 2014 · 13 yr
- Origin networks
- 1
IRR inside
Route objects inside
| Prefix | Origin | Registry | Description | Maintainer | Modified |
|---|---|---|---|---|---|
| 205.240.0.0/24 | AS3364 | RADB | PNAP-DEN csdco | MAINT-AS1828 | Nov 13, 2023 |
| 205.240.1.0/24 | AS3364 | RADB | PNAP-DEN csdco | MAINT-AS1828 | Nov 13, 2023 |
| 205.240.2.0/24 | AS3364 | RADB | PNAP-DEN csdco | MAINT-AS1828 | Nov 13, 2023 |
| 205.240.3.0/24 | AS3364 | RADB | PNAP-DEN csdco | MAINT-AS1828 | Nov 13, 2023 |
| 205.240.4.0/24 | AS3364 | RADB | PNAP-DEN csdco | MAINT-AS1828 | Nov 13, 2023 |
| 205.240.5.0/24 | AS3364 | RADB | PNAP-DEN csdco | MAINT-AS1828 | Nov 13, 2023 |
| 205.240.6.0/24 | AS3364 | RADB | PNAP-DEN csdco | MAINT-AS1828 | Nov 13, 2023 |
| 205.240.7.0/24 | AS3364 | RADB | PNAP-DEN csdco | MAINT-AS1828 | Nov 13, 2023 |
| 205.240.8.0/24 | AS3364 | RADB | PNAP-DEN csdco | MAINT-AS1828 | Nov 13, 2023 |
| 205.240.9.0/24 | AS3364 | RADB | PNAP-DEN csdco | MAINT-AS1828 | Nov 13, 2023 |
| 205.240.10.0/24 | AS3364 | RADB | PNAP-DEN csdco | MAINT-AS1828 | Nov 13, 2023 |
| 205.240.11.0/24 | AS3364 | RADB | PNAP-DEN csdco | MAINT-AS1828 | Nov 13, 2023 |
| 205.240.12.0/24 | AS3364 | RADB | PNAP-DEN csdco | MAINT-AS1828 | Nov 13, 2023 |
| 205.240.13.0/24 | AS3364 | RADB | PNAP-DEN csdco | MAINT-AS1828 | Nov 13, 2023 |
| 205.240.14.0/24 | AS3364 | RADB | PNAP-DEN csdco | MAINT-AS1828 | Nov 13, 2023 |
| 205.240.15.0/24 | AS3364 | RADB | PNAP-DEN csdco | MAINT-AS1828 | Nov 13, 2023 |
Whois
Registration for this announcement
- Range
- 205.
240. 0. 0/ 20 - Netname
- SPRINT-CDF00F
- Registrant
- Computer Systems Design Company
- Organization
- Computer Systems Design Company (CSD)
- Org address
- 735 Highland Avenue, Boulder, CO, 80302
- Org country
- US
- Type
- Reallocated
- Handle
- NET-205-240-0-0-2
- Parent
- NET-205-240-0-0-1
- Created
- Apr 25, 1995
- RIR
- ARIN
- Country
- US
- Delegated
- Apr 24, 1995
- Status
- assigned
Report abuse
Abuse contact
- john.
nebel@ csd. net - Name
- Nebel, John
- Phone
- +1-303-447-8025
- Handle
- JN20-ARIN