DigitalOcean Referral Badge
cloud1
cloud2
cloud3
cloud4
cloud5
cloud6

Interesting Subnets

Directory of active subnets observed by Syndu. Each row is the latest cached SubnetSnapshot per subnet and includes: density, traffic, geo/ASN representatives, and risk distribution.
Active filter: CESNET z.s.p.o. · Clear
Snapshot 2026-01-23 Results 8 Page 1 / 1

147.228.128.0/24

Risk Max — LOW Footprint 0.391% Hits 24
Prefix / IP version
/24 · IPv4
Network
147.228.128.0
Broadcast
147.228.128.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
49.701600000000006 , 13.350699999999998
Hits / Errors
24 hits · 2 errors
First / Last seen
2024-12-11 20:56 · 2024-12-11 20:58
Top ASN
AS2852 · CESNET z.s.p.o.
Top organization / ISP
Zapadoceska univerzita v Plzni · CESNET z.s.p.o.
Top geo
Czechia · Plzeň Region · Pilsen
Window / Updated
2024-12-09 → 2024-12-16 · Updated 2026-01-14 · v2
Open report →

78.128.203.0/24

Risk Max — LOW Footprint 0.391% Hits 15
Prefix / IP version
/24 · IPv4
Network
78.128.203.0
Broadcast
78.128.203.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.0512 , 15.7769
Hits / Errors
15 hits · 0 errors
First / Last seen
2025-03-10 11:04 · 2025-03-10 11:04
Top ASN
AS2852 · CESNET z.s.p.o.
Top organization / ISP
Charles University · CESNET-TCZ
Top geo
Czechia · Pardubický kraj · Pardubice
Window / Updated
2025-03-10 → 2025-03-17 · Updated 2026-01-14 · v2
Open report →

195.113.175.0/24

Risk Max — LOW Footprint 0.391% Hits 10
Prefix / IP version
/24 · IPv4
Network
195.113.175.0
Broadcast
195.113.175.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.794999999999995 , 15.021099999999999
Hits / Errors
10 hits · 0 errors
First / Last seen
2025-05-23 12:25 · 2025-05-23 12:29
Top ASN
AS2852 · CESNET z.s.p.o.
Top organization / ISP
Vysoka skola banska - Technicka univerzita Ostrava · CESNET-TCZ
Top geo
Czechia · Liberecký kraj · Liberec
Window / Updated
2025-05-19 → 2025-05-26 · Updated 2026-01-14 · v2
Open report →

147.32.87.0/24

Risk Max — LOW Footprint 0.391% Hits 2
Prefix / IP version
/24 · IPv4
Network
147.32.87.0
Broadcast
147.32.87.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.1113 , 14.4063
Hits / Errors
2 hits · 0 errors
First / Last seen
2025-04-02 03:07 · 2025-04-02 03:07
Top ASN
AS2852 · CESNET z.s.p.o.
Top organization / ISP
Ceske vysoke uceni technicke v Praze · CESNET z.s.p.o.
Top geo
Czechia · Prague · Prague
Window / Updated
2025-03-31 → 2025-04-07 · Updated 2026-01-14 · v2
Open report →

147.251.58.0/24

Risk Max — LOW Footprint 0.391% Hits 2
Prefix / IP version
/24 · IPv4
Network
147.251.58.0
Broadcast
147.251.58.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
49.1953 , 16.6016
Hits / Errors
2 hits · 0 errors
First / Last seen
2024-12-27 18:41 · 2024-12-27 18:41
Top ASN
AS2852 · CESNET z.s.p.o.
Top organization / ISP
Masarykova univerzita - Ustav vypocetni techniky · CESNET z.s.p.o.
Top geo
Czechia · South Moravian · Brno
Window / Updated
2024-12-23 → 2024-12-30 · Updated 2026-01-14 · v2
Open report →

195.113.172.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
195.113.172.0
Broadcast
195.113.172.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.795 , 15.0211
Hits / Errors
1 hits · 0 errors
First / Last seen
2025-10-28 07:24 · 2025-10-28 07:24
Top ASN
AS2852 · CESNET z.s.p.o.
Top organization / ISP
CESNET z.s.p.o · CESNET z.s.p.o.
Top geo
Czechia · Liberecký kraj · Liberec
Window / Updated
2025-10-27 → 2025-11-03 · Updated 2026-01-14 · v2
Open report →

147.251.22.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
147.251.22.0
Broadcast
147.251.22.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
49.5487 , 17.3316
Hits / Errors
1 hits · 0 errors
First / Last seen
2025-10-28 07:23 · 2025-10-28 07:23
Top ASN
AS2852 · CESNET z.s.p.o.
Top organization / ISP
Masarykova univerzita - Ustav vypocetni techniky · CESNET z.s.p.o.
Top geo
Czechia · Olomoucký kraj · Velký Týnec
Window / Updated
2025-10-27 → 2025-11-03 · Updated 2026-01-14 · v2
Open report →

195.178.71.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
195.178.71.0
Broadcast
195.178.71.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
49.2295 , 17.6658
Hits / Errors
1 hits · 0 errors
First / Last seen
2025-09-12 06:15 · 2025-09-12 06:15
Top ASN
AS2852 · CESNET z.s.p.o.
Top organization / ISP
Institute of Scientific Instruments of the ASCR, v.v.i. · CESNET-T34CZ
Top geo
Czechia · Zlín · Zlín
Window / Updated
2025-09-08 → 2025-09-15 · Updated 2026-01-14 · v2
Open report →