University of Ostrava — IP ranges & network footprint

Footprint over time

7 weekly snapshots · JSON

8 0 netblocks since 2026-07-05

2026-07-05 peak 8 2026-08-09

IP Ranges (8)

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CIDR	Org name	Registry	Status	Confidence
78.128.128.0 – 78.128.146.255	University of Ostrava	RIPE	ASSIGNED PA	● high
195.113.102.0 – 195.113.112.127	University of Ostrava	RIPE	ASSIGNED PA	● high
195.113.209.36/30	University of Ostrava	RIPE	ASSIGNED PA	● high
195.113.209.48/30	University of Ostrava	RIPE	ASSIGNED PA	● high
195.113.209.56/29	University of Ostrava	RIPE	ASSIGNED PA	● high
2001:718:1000:5::/64	University of Ostrava	RIPE	ASSIGNED	● high
2001:718:1000:8005::/64	University of Ostrava	RIPE	ASSIGNED	● high
2001:718:1005::/48	University of Ostrava	RIPE	ASSIGNED	● high

IPv6 ranges (3)

CIDR
2001:718:1005::/48
2001:718:1000:5::/64
2001:718:1000:8005::/64

Domains hosted in this network

what's this?

osu.cz

Possibly related to this organisation

what's this?

Same name family

Separately-registered clusters whose names share “University of” — often per-country or per-system registrations of the same brand, occasionally a different organisation sharing the name. Not counted in this organisation's own footprint.

University of Puerto Rico 200 blocks
University of Western Sydney 145 blocks
UNIVERSITY OF ULSAN 78 blocks
University of Southern California 71 blocks
University of Central Florida 62 blocks
UNIVERSITY OF INCHEON 59 blocks
University of Missouri - dba the Missouri Research and Education Network (MOREnet) 56 blocks
University of Texas System 54 blocks

Combined view of all 464 name-family clusters →

Sub-allocations under carriers

IP blocks an ISP reassigned to a similarly-named customer — decoded from the ISP's own naming convention, not a direct registration.

SUNWAY-UNIVERSITY via Extreme Broadband sub-allocation
MONASHUNIVERSITYPRATOCENTRE sub-allocation
NATIONAL-UNIVERSITY-OF-WATER-AND-ENVIRONMENTAL-ENGINEERING via PRIVATE JOINT STOCK COMPANY "DATAGROUP" sub-allocation
Kaduna_State_University sub-allocation
HRB-ENGINEER-UNIVERSITY-SJ-ELECTRON-COMMERCE-FILIALE via CNCGROUP IP network of ShangHai IDC sub-allocation
XIAMEN-UNIVERSITY via CNCGROUP IP network of ShangHai IDC sub-allocation
Quanzhou-Huaqiao-University-Corp via CNCGROUP IP network of ShangHai IDC sub-allocation
DEFENCE-UNIVERSITY via Ethiopian Educational Research Network (EthERNet) sub-allocation

Network trust

what's this?

RPKI hygiene: A how networks compare →

100.0% of checked blocks have valid RPKI ROA coverage (8 of 8)

Possible discrepancies (3)

These blocks are registered to University of Ostrava 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.

2001:718:1005::/48 /48	authorized for AS2852 — CESNET z.s.p.o.
78.128.128.0 – 78.128.146.255 /20	authorized for AS2852 — CESNET z.s.p.o.
195.113.102.0 – 195.113.112.127 /21	authorized for AS2852 — CESNET z.s.p.o.

NIC Handles

DUMY-RIPE DUMY-RIPE ORG-UoO2-RIPE TENCZ-MNT

Netblocks	8 · 7,568 IPv4 addresses
IPv6	3 prefixes (largest 2001:718:1005::/48)
All fragments	3,330 blocks across 464 clusters
Cluster ID	218196120
Registry	RIPE
Customers	find customers using this network →

Attribution	BGP parent (inherited)
Shared handles	clustered on 4 shared RIR contact/maintainer handles
Registry names	1 distinct registrant name across these blocks
full provenance (JSON) → · how attribution works · report an issue