Fourth
Data as of 2026-09-13
Registry
This organisation
| Netblocks | 2 · 512 IPv4 addresses |
| Also registered under this name | 23 netblocks across 20 separate records |
| Record ID | 242672139 |
| Registry | RIPE |
| Customers | see who runs inside this network → |
Evidence & provenance ?
| Attribution | Registry record |
| Shared handles | clustered on 4 shared RIR contact/maintainer handles |
| Registry names | 2 distinct registrant names across these blocks |
| full provenance (JSON) → · how attribution works · report an issue | |
IP Ranges (2)
⬇ export CSV| CIDR | Org name | Registry | Status | Confidence |
|---|---|---|---|---|
| 185.91.15.0/24 | fourth | RIPE | ASSIGNED PA | ● low |
| 185.101.75.0/24 | Fourth | RIPE | ASSIGNED PA | ● low |
Network trust
what's this?
RPKI hygiene: C
how networks compare →
50.0%
of checked blocks have valid RPKI ROA coverage
(1 of 2)
Possible discrepancies (1)
These blocks are registered to Fourth but cryptographically authorized for a different, unrelated network (1 distinct holder) — often M&A history, multi-homing, or outsourced/managed hosting, occasionally worth a closer look.
| 185.91.15.0/24 /24 | authorized for AS39114 — 1KEY BV |
NIC Handles
DUMY-RIPE
DUMY-RIPE
MNT-1KEY
pl-netsharks-1-mnt