Data as of Nov 6, 2026
199.221.128.0/24
No anonymizer space · no proxy exits in 30 daysComputer Systems Design Company · space held by Verizon Business
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | Holder | RPKI |
|---|---|---|---|---|
| 199.221.0.0/16 since May 2005 | AS701 | Internet provider | Verizon Business |
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 |
|---|---|---|---|---|---|---|
| 199. | 262,144 | ANS-C-BLOCK2 | Verizon Business (MCICS) · US | Direct Allocation | Jun 8, 1994 | abuse@ |
| └ 199.221.128.0/21 | 2,048 | CSDC-ANS | Computer Systems Design Company (CSD-3) · US | Reassigned | Jul 1, 1998 | john. |
Network & registry
Announced by
Covering announcement 199.221.128.0/21
- Prefix
- 199.221.128.0/21
- Announced by
- AS3364 Computer Systems Design Company
- Type
- Business
- RPKI
- No RPKI
- Netname
- CSDC-ANS
- Registrant
- Computer Systems Design Company
- RIR
- ARIN
IPv4 market
Holder
- Organization
- Verizon Business
- Handle
- MCICS
- Range
- 199.
219. 0. 0 - 199. 222. 255. 255 - Registration type
- Direct Allocation
- Record created
- Jun 8, 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
199.221.128.0/21
Routing history
- Pattern
- Stable
- First seen
- May 2005
- Current origin since
- May 2005 · 21 yr
- Origin networks
- 1
IRR
Route objects on 199.221.128.0/21
| Origin | Registry | Description | Maintainer | Modified |
|---|---|---|---|---|
| AS3364 | RADB | PNAP-DEN csdco | MAINT-AS1828 | Nov 13, 2023 |
Whois
Registration for this announcement
- Range
- 199.
221. 128. 0/ 21 - Netname
- CSDC-ANS
- Registrant
- Computer Systems Design Company
- Organization
- Computer Systems Design Company (CSD-3)
- Org address
- 735 Highland Avenue, Boulder, CO, 80302
- Org country
- US
- Type
- Reassigned
- Handle
- NET-199-221-128-0-1
- Parent
- NET-199-219-0-0-1
- Created
- Jul 1, 1998
- RIR
- ARIN
- Country
- US
- Delegated
- Jun 8, 1994
- Status
- assigned
Report abuse
Abuse contact
- john.
nebel@ csd. net - Name
- Nebel, John
- Phone
- +1-303-618-7345
- Handle
- JN24-ARIN