Data as of Nov 12, 2026
207.10.136.0/21
No anonymizer space · no proxy exits in 30 daysColumbia University · space held by Lamont-Doherty Earth Observatory of Columbia University
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 |
|---|---|---|---|---|---|---|
| 207.10.136.0/21 | 2,048 | LDGO | Lamont-Doherty Earth Observatory of Columbia University (LDGO) · US | Direct Allocation | Nov 20, 2025 | noc@ |
| └ 207.10.136.0/21 | 2,048 | CU-NET-207-10-136 | Columbia University (COLUMB) · US | Reassigned | May 12, 1999 | noc@ |
Network & registry
Registry
Holder
- Organization
- Lamont-Doherty Earth Observatory of Columbia University
- Handle
- LDGO
- Range
- 207.
10. 136. 0/ 21 - Registration type
- Direct Allocation
- Record created
- Nov 20, 2025
Origin network
AS14
US
- Name
- Columbia University
- Type
- Education
- Domain
- columbia.edu
- Industry
- Colleges, Universities, and Professional Schools
- Spamhaus ASN-DROP
- not listed
Routing timeline
Who has announced this prefix
Summary
Routing history
- Pattern
- Stable
- First seen
- May 2005
- Current origin since
- May 2005 · 22 yr
- Origin networks
- 1
IRR
Route objects on the exact prefix
| Origin | Registry | Description | Maintainer | Modified |
|---|---|---|---|---|
| AS14 | RADB | CU-NET-207-10-136-0 | MAINT-AS14 | Nov 13, 2023 |
Whois
Registration for this announcement
- Range
- 207.
10. 136. 0/ 21 - Netname
- CU-NET-207-10-136
- Registrant
- Columbia University
- Organization
- Columbia University (COLUMB)
- Org address
- 612 W 115TH ST, NEW YORK, NY, 10025
- Org country
- US
- Type
- Reassigned
- Handle
- NET-207-10-136-0-1
- Parent
- NET-207-10-136-0-2
- Created
- May 12, 1999
- RIR
- ARIN
- Country
- US
- Delegated
- Nov 20, 2025
- Status
- assigned
Report abuse
Abuse contact
- noc@
columbia. edu - Name
- Columbia University Computer Operations
- Phone
- +1-212-854-1919
- Handle
- CU-NOC-ARIN