Data as of Nov 5, 2026
204.121.217.0/24
No anonymizer space · no proxy exits in 30 daysLos Alamos National Laboratory
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 |
|---|---|---|---|---|---|---|
| 204.121.0.0/16 | 65,536 | NOTES-CBLK | Los Alamos National Laboratory (LANL-2-Z) · US | Direct Allocation | Aug 12, 1994 | csirt@ |
| └ 204.121.217.0/24 | 256 | BOULDER2-DOM-NET | unknown | — | — | — |
Network & registry
Announced by
Covering announcement 204.121.0.0/16
- Prefix
- 204.121.0.0/16
- Announced by
- AS68 Los Alamos National Laboratory
- Type
- Business
- Proxy exits
- 1
- RPKI
- RPKI valid
- Netname
- NOTES-CBLK
- Registrant
- Los Alamos National Laboratory
- RIR
- ARIN
Origin network
AS68
US
- Name
- Los Alamos National Laboratory
- Type
- Business
- Registered
- Apr 10, 1986
- Domain
- lanl.gov
- Industry
- Government and Regulatory Agencies, Administrations, Departments, and Services
- Spamhaus ASN-DROP
- not listed
Routing timeline
Who has announced 204.121.0.0/16
204.121.0.0/16
Routing history
- Pattern
- Stable
- First seen
- May 2005
- Current origin since
- May 2005 · 21 yr
- Origin networks
- 1
RPKI
Route origin authorizations
| ROA prefix | ASN | Max len | Anchor | Verdict |
|---|---|---|---|---|
| 204.121.0.0/16 | AS68 | /16 | ARIN | RPKI valid |
IRR
Route objects on 204.121.0.0/16
| Origin | Registry | Description | Maintainer | Modified |
|---|---|---|---|---|
| AS68 | ARIN | LANL | MNT-LANL-2-Z | Nov 18, 2025 |
Whois
Registration for this announcement
- Range
- 204.
121. 0. 0/ 16 - Netname
- NOTES-CBLK
- Registrant
- Los Alamos National Laboratory
- Organization
- Los Alamos National Laboratory (LANL-2-Z)
- Org address
- P. O. Box 1663, Los Alamos, NM, 87545
- Org country
- US
- Type
- Direct Allocation
- Handle
- NET-204-121-0-0-1
- Parent
- NET-204-0-0-0-0
- Created
- Aug 12, 1994
- RIR
- ARIN
- Country
- US
- Delegated
- Aug 12, 1994
- Status
- assigned
Report abuse
Abuse contact
- csirt@
lanl. gov - Name
- CSIRT
- Phone
- +1-505-665-8641
- Handle
- CSIRT1-ARIN