Data as of Nov 9, 2026
192.51.54.0/24
No anonymizer space · no proxy exits in 30 daysCOLT Technology Services Group Limited · space held by imported inetnum object for JNIC
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 |
|---|---|---|---|---|---|---|
| 192.51.52.0/22 | 1,024 | JAPAN-INET-BLOCK4 | imported inetnum object for JNIC | ALLOCATED PORTABLE | — | hostmaster@ |
| └ 192. | 768 | MSINET | NTT DATA Mathematical Systems Inc. | ASSIGNED PORTABLE | — | hostmaster@ |
Network & registry
IPv4 market
Holder
- Organization
- imported inetnum object for JNIC
- Range
- 192.
51. 52. 0/ 22 - Registration type
- ALLOCATED PORTABLE
Origin network
AS8220
GB
- Name
- COLT Technology Services Group Limited
- Type
- Internet provider
- Registered
- Feb 24, 1997
- Domain
- colt.net
- Website
- www.colt.net
- Industry
- Internet Service Provider (ISP)
- Spamhaus ASN-DROP
- not listed
Routing timeline
Who has announced this prefix
Summary
Routing history
- Pattern
- Rotating
- First seen
- May 2005
- Current origin since
- Oct 2024 · 2.1 yr
- Origin networks
- 3
- Last change of origin
- Oct 2024
Recorded history
History
- Handoffs
- 2
IRR
Route objects on the exact prefix
| Origin | Registry | Description | Maintainer | Modified |
|---|---|---|---|---|
| AS8220 | RADB | MATHEMATiCAL SYSTEMS iNSTiTUTE iNC. | MAINT-AS8220 | Oct 4, 2024 |
Whois
Registration for this announcement
- Range
- 192.
51. 52. 0 - 192. 51. 54. 255 - Netname
- MSINET-CIDR-BLK-JP
- Registrant
- NTT DATA Mathematical Systems Inc.
- Registrant country
- JP
- Organization
- NTT DATA Mathematical Systems Inc.
- Org country
- JP
- Created
- Not stated by the registry
- Updated
- Oct 14, 2026
- RIR
- APNIC
- Country
- JP
- Delegated
- Jul 11, 1994
- Status
- assigned