Data as of Nov 13, 2026
37.221.255.0/24
No anonymizer space · no proxy exits in 30 daysJiri Tlapak · space held by ISP Alliance a.s.
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 |
|---|---|---|---|---|---|---|
| 37.221.240.0/20 | 4,096 | CZ-GRAPESC-20120410 | ISP Alliance a.s. (ORG-GSA22-RIPE) · CZ | ALLOCATED PA | Apr 10, 2012 | abuse@ |
| └ 37.221.255.0/24 | 256 | TLAPNET-CORE | Tlapnet s.r.o. (ORG-TS210-RIPE) · CZ | ASSIGNED PA | Nov 5, 2012 | servis@ |
Network & registry
Announced by
Covering announcement 37.221.240.0/20
- Prefix
- 37.221.240.0/20
- Announced by
- AS204666 Jiri Tlapak
- Type
- Residential
- Proxy exits
- 207
- Always-on exits
- 31
- RPKI
- RPKI valid
- Netname
- CZ-GRAPESC-20120410
- Registrant
- ISP Alliance a.s.
- RIR
- RIPE NCC
Origin network
AS204666
CZ
- Name
- Jiri Tlapak
- Type
- Internet provider
- Registered
- Jan 29, 2018
- Domain
- tlapnet.cz
- Spamhaus ASN-DROP
- not listed
Routing timeline
Who has announced 37.221.240.0/20
37.221.240.0/20
Routing history
- Pattern
- Rotating
- First seen
- May 2012
- Current origin since
- May 2025 · 1.5 yr
- Origin networks
- 4
- Last change of origin
- May 2025
Recorded history
History
- Handoffs
- 3
RPKI
Route origin authorizations
| ROA prefix | ASN | Max len | Anchor | Verdict |
|---|---|---|---|---|
| 37.221.240.0/20 | AS198668 | /32 | RIPE | Another network |
| 37.221.240.0/20 | AS204666 | /24 | RIPE | RPKI valid |
Whois
Registration for this announcement
- Range
- 37.
221. 240. 0/ 20 - Netname
- CZ-GRAPESC-20120410
- Registrant
- ISP Alliance a.s.
- Registrant country
- CZ
- Organization
- ISP Alliance a.s. (ORG-GSA22-RIPE)
- Org country
- CZ
- Type
- ALLOCATED PA
- Created
- Apr 10, 2012
- Updated
- May 20, 2016
- Maintainer
- RIPE-NCC-HM-MNT
- RIR
- RIPE NCC
- Country
- CZ
- Delegated
- Apr 10, 2012
- Status
- assigned
Report abuse
Abuse contact
- abuse@
ispalliance. cz - Name
- ISPalliance Abuse
- Handle
- IA3261-RIPE