OT - OPTIMA TELEKOM d.d.
Cluster stats
| Netblocks | 21 |
| All fragments | 57 blocks across 26 clusters |
| Cluster ID | 193413570 |
| Registry | RIPE |
| Customers | find customers using this network → |
Evidence & provenance ?
| Attribution | unresolved |
| Shared handles | clustered on 5 shared RIR contact/maintainer handles |
| Registry names | 1 distinct registrant name across these blocks |
| full provenance (JSON) → · how attribution works | |
IP Ranges (21)
⬇ export CSV| CIDR | Org name | Registry | Status | Confidence |
|---|---|---|---|---|
| 5.39.128.1 – 5.39.135.254 | OT - OPTIMA TELEKOM d.d. | RIPE | ASSIGNED PA | ● high |
| 5.39.136.1 – 5.39.143.254 | OT - OPTIMA TELEKOM d.d. | RIPE | ASSIGNED PA | ● high |
| 5.39.144.1 – 5.39.151.254 | OT - OPTIMA TELEKOM d.d. | RIPE | ASSIGNED PA | ● high |
| 5.39.152.1 – 5.39.159.254 | OT - OPTIMA TELEKOM d.d. | RIPE | ASSIGNED PA | ● high |
| 37.60.128.0/22 | OT - OPTIMA TELEKOM d.d. | RIPE | ASSIGNED PA | ● high |
| 37.60.132.0/22 | OT - OPTIMA TELEKOM d.d. | RIPE | ASSIGNED PA | ● high |
| 37.205.96.0/21 | OT - OPTIMA TELEKOM d.d. | RIPE | ASSIGNED PA | ● high |
| 37.205.104.0/21 | OT - OPTIMA TELEKOM d.d. | RIPE | ASSIGNED PA | ● high |
| 80.80.54.0/23 | OT - OPTIMA TELEKOM d.d. | RIPE | ASSIGNED PA | ● high |
| 80.80.58.0/24 | OT - OPTIMA TELEKOM d.d. | RIPE | ASSIGNED PA | ● high |
| 80.80.63.0/24 | OT - OPTIMA TELEKOM d.d. | RIPE | ASSIGNED PA | ● high |
| 89.17.0.0/20 | OT - OPTIMA TELEKOM d.d. | RIPE | ASSIGNED PA | ● high |
| 89.17.16.0/20 | OT - OPTIMA TELEKOM d.d. | RIPE | ASSIGNED PA | ● high |
| 151.252.208.0/22 | OT - OPTIMA TELEKOM d.d. | RIPE | ASSIGNED PA | ● high |
| 151.252.212.0/22 | OT - OPTIMA TELEKOM d.d. | RIPE | ASSIGNED PA | ● high |
| 151.252.224.0/21 | OT - OPTIMA TELEKOM d.d. | RIPE | ASSIGNED PA | ● high |
| 151.252.232.0/21 | OT - OPTIMA TELEKOM d.d. | RIPE | ASSIGNED PA | ● high |
| 151.252.240.0/21 | OT - OPTIMA TELEKOM d.d. | RIPE | ASSIGNED PA | ● high |
| 151.252.248.0/21 | OT - OPTIMA TELEKOM d.d. | RIPE | ASSIGNED PA | ● high |
| 185.10.40.0/23 | OT - OPTIMA TELEKOM d.d. | RIPE | ASSIGNED PA | ● high |
| 185.10.42.0/24 | OT - OPTIMA TELEKOM d.d. | RIPE | ASSIGNED PA | ● high |
Network trust
what's this?
RPKI hygiene: A
how networks compare →
100.0%
of checked blocks have valid RPKI ROA coverage
(21 of 21)
Possible discrepancies (21)
These blocks are registered to OT - OPTIMA TELEKOM d.d. 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.
| 89.17.0.0/20 /20 | authorized for AS34594 — Telemach Hrvatska d.o.o. |
| 89.17.16.0/20 /20 | authorized for AS34594 — Telemach Hrvatska d.o.o. |
| 37.205.96.0/21 /21 | authorized for AS34594 — Telemach Hrvatska d.o.o. |
| 37.205.104.0/21 /21 | authorized for AS34594 — Telemach Hrvatska d.o.o. |
| 151.252.224.0/21 /21 | authorized for AS34594 — Telemach Hrvatska d.o.o. |
| 151.252.232.0/21 /21 | authorized for AS34594 — Telemach Hrvatska d.o.o. |
| 151.252.240.0/21 /21 | authorized for AS34594 — Telemach Hrvatska d.o.o. |
| 151.252.248.0/21 /21 | authorized for AS34594 — Telemach Hrvatska d.o.o. |
| 5.39.128.1 – 5.39.135.254 /21 | authorized for AS34594 — Telemach Hrvatska d.o.o. |
| 5.39.136.1 – 5.39.143.254 /21 | authorized for AS34594 — Telemach Hrvatska d.o.o. |
| 5.39.144.1 – 5.39.151.254 /21 | authorized for AS34594 — Telemach Hrvatska d.o.o. |
| 5.39.152.1 – 5.39.159.254 /21 | authorized for AS34594 — Telemach Hrvatska d.o.o. |
| 37.60.128.0/22 /22 | authorized for AS34594 — Telemach Hrvatska d.o.o. |
| 37.60.132.0/22 /22 | authorized for AS34594 — Telemach Hrvatska d.o.o. |
| 151.252.208.0/22 /22 | authorized for AS34594 — Telemach Hrvatska d.o.o. |
+6 more — see the REST API
NIC Handles
DUMY-RIPE
DUMY-RIPE
ORG-OTD1-RIPE
OT-MNT
mnt-hr-tele2-1