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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: CZ.CZNET · Clear
Snapshot 2026-01-20 Results 27 Page 1 / 1

109.81.16.0/24

Risk Max — LOW Footprint 0.781% Hits 2
Prefix / IP version
/24 · IPv4
Network
109.81.16.0
Broadcast
109.81.16.255
Observed IPs / Subnet size
2 observed · 256 total
Centroid
50.0883 , 14.4124
Hits / Errors
2 hits · 0 errors
First / Last seen
2025-09-17 08:22 · 2025-09-17 14:23
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CZ.CZNET · O2 Czech Republic
Top geo
Czechia · Prague · Prague
Window / Updated
2025-09-15 → 2025-09-22 · Updated 2026-01-14 · v2
Open report →

109.81.87.0/24

Risk Max — LOW Footprint 0.391% Hits 35
Prefix / IP version
/24 · IPv4
Network
109.81.87.0
Broadcast
109.81.87.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.0883 , 14.4124
Hits / Errors
35 hits · 0 errors
First / Last seen
2025-02-26 18:50 · 2025-02-26 18:55
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CZ.CZNET · Telefonica O2 Czech Republic, a.s.
Top geo
Czechia · Prague · Prague
Window / Updated
2025-02-24 → 2025-03-03 · Updated 2026-01-14 · v2
Open report →

109.81.92.0/24

Risk Max — LOW Footprint 0.391% Hits 17
Prefix / IP version
/24 · IPv4
Network
109.81.92.0
Broadcast
109.81.92.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.0948 , 14.4785
Hits / Errors
17 hits · 0 errors
First / Last seen
2025-01-22 13:56 · 2025-01-22 13:58
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CZ.CZNET · Telefonica O2 Czech Republic, a.s.
Top geo
Czechia · Prague · Prague
Window / Updated
2025-01-20 → 2025-01-27 · Updated 2026-01-14 · v2
Open report →

109.81.1.0/24

Risk Max — LOW Footprint 0.391% Hits 14
Prefix / IP version
/24 · IPv4
Network
109.81.1.0
Broadcast
109.81.1.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.0948 , 14.4785
Hits / Errors
14 hits · 0 errors
First / Last seen
2025-07-07 12:49 · 2025-07-07 12:53
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
— · CZ.CZNET
Top geo
Czechia · Prague · Prague
Window / Updated
2025-07-07 → 2025-07-14 · Updated 2026-01-14 · v2
Open report →

109.81.88.0/24

Risk Max — LOW Footprint 0.391% Hits 13
Prefix / IP version
/24 · IPv4
Network
109.81.88.0
Broadcast
109.81.88.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.0802 , 14.4652
Hits / Errors
13 hits · 0 errors
First / Last seen
2025-08-19 17:57 · 2025-08-19 17:57
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CZ.CZNET · Telefonica O2 Czech Republic, a.s.
Top geo
Czechia · Prague · Prague
Window / Updated
2025-08-18 → 2025-08-25 · Updated 2026-01-14 · v2
Open report →

88.101.37.0/24

Risk Max — LOW Footprint 0.391% Hits 12
Prefix / IP version
/24 · IPv4
Network
88.101.37.0
Broadcast
88.101.37.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.0687 , 14.3947
Hits / Errors
12 hits · 0 errors
First / Last seen
2024-11-26 22:47 · 2024-11-26 22:49
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CZ.CZNET · Telefonica O2 Czech Republic, a.s.
Top geo
Czechia · Prague · Prague
Window / Updated
2024-11-25 → 2024-12-02 · Updated 2026-01-14 · v2
Open report →

88.101.92.0/24

Risk Max — LOW Footprint 0.391% Hits 2
Prefix / IP version
/24 · IPv4
Network
88.101.92.0
Broadcast
88.101.92.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.4363 , 15.4625
Hits / Errors
2 hits · 0 errors
First / Last seen
2025-09-28 10:17 · 2025-09-28 10:17
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CZ.CZNET · Telefonica O2 Czech Republic, a.s.
Top geo
Czechia · Královéhradecký kraj · Lužany
Window / Updated
2025-09-22 → 2025-09-29 · Updated 2026-01-14 · v2
Open report →

85.70.78.0/24

Risk Max — LOW Footprint 0.391% Hits 2
Prefix / IP version
/24 · IPv4
Network
85.70.78.0
Broadcast
85.70.78.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.1242 , 14.398
Hits / Errors
2 hits · 0 errors
First / Last seen
2025-09-17 11:01 · 2025-09-17 11:01
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CZ.CZNET · Telefonica O2 Czech Republic, a.s.
Top geo
Czechia · Prague · Prague
Window / Updated
2025-09-15 → 2025-09-22 · Updated 2026-01-14 · v2
Open report →

83.208.47.0/24

Risk Max — LOW Footprint 0.391% Hits 2
Prefix / IP version
/24 · IPv4
Network
83.208.47.0
Broadcast
83.208.47.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.1155 , 14.4124
Hits / Errors
2 hits · 0 errors
First / Last seen
2025-09-14 02:41 · 2025-09-14 02:41
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CZ.CZNET · Telefonica O2 Czech Republic, a.s.
Top geo
Czechia · Prague · Prague
Window / Updated
2025-09-08 → 2025-09-15 · Updated 2026-01-14 · v2
Open report →

109.81.0.0/24

Risk Max — LOW Footprint 0.391% Hits 2
Prefix / IP version
/24 · IPv4
Network
109.81.0.0
Broadcast
109.81.0.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.0948 , 14.4785
Hits / Errors
2 hits · 0 errors
First / Last seen
2025-09-09 09:41 · 2025-09-09 09:41
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
— · CZ.CZNET
Top geo
Czechia · Prague · Prague
Window / Updated
2025-09-08 → 2025-09-15 · Updated 2026-01-14 · v2
Open report →

90.181.164.0/24

Risk Max — LOW Footprint 0.391% Hits 2
Prefix / IP version
/24 · IPv4
Network
90.181.164.0
Broadcast
90.181.164.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
49.8542 , 18.2633
Hits / Errors
2 hits · 0 errors
First / Last seen
2025-05-13 19:04 · 2025-05-13 19:04
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CZ.CZNET · Telefonica O2 Czech Republic, a.s.
Top geo
Czechia · Moravskoslezský kraj · Ostrava
Window / Updated
2025-05-12 → 2025-05-19 · Updated 2026-01-14 · v2
Open report →

90.177.109.0/24

Risk Max — LOW Footprint 0.391% Hits 2
Prefix / IP version
/24 · IPv4
Network
90.177.109.0
Broadcast
90.177.109.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.3507 , 14.47
Hits / Errors
2 hits · 0 errors
First / Last seen
2025-03-28 23:35 · 2025-03-28 23:35
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CZ.CZNET · Telefonica O2 Czech Republic, a.s.
Top geo
Czechia · Central Bohemia · Mělník
Window / Updated
2025-03-24 → 2025-03-31 · Updated 2026-01-14 · v2
Open report →

109.81.22.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
109.81.22.0
Broadcast
109.81.22.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.0802 , 14.4652
Hits / Errors
1 hits · 1 errors
First / Last seen
2025-10-14 13:42 · 2025-10-14 13:42
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CZ.CZNET · O2 Czech Republic
Top geo
Czechia · Prague · Prague
Window / Updated
2025-10-13 → 2025-10-20 · Updated 2026-01-14 · v2
Open report →

109.81.4.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
109.81.4.0
Broadcast
109.81.4.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.0948 , 14.4785
Hits / Errors
1 hits · 1 errors
First / Last seen
2025-10-05 04:01 · 2025-10-05 04:01
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
— · CZ.CZNET
Top geo
Czechia · Prague · Prague
Window / Updated
2025-09-29 → 2025-10-06 · Updated 2026-01-14 · v2
Open report →

80.188.223.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
80.188.223.0
Broadcast
80.188.223.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.795 , 15.0211
Hits / Errors
1 hits · 1 errors
First / Last seen
2025-10-04 06:18 · 2025-10-04 06:18
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CZ.CZNET · O2 Czech Republic
Top geo
Czechia · Liberecký kraj · Liberec
Window / Updated
2025-09-29 → 2025-10-06 · Updated 2026-01-14 · v2
Open report →

109.81.2.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
109.81.2.0
Broadcast
109.81.2.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.0948 , 14.4785
Hits / Errors
1 hits · 0 errors
First / Last seen
2025-09-22 07:43 · 2025-09-22 07:43
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
— · CZ.CZNET
Top geo
Czechia · Prague · Prague
Window / Updated
2025-09-22 → 2025-09-29 · Updated 2026-01-14 · v2
Open report →

88.102.208.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
88.102.208.0
Broadcast
88.102.208.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.0471 , 14.4523
Hits / Errors
1 hits · 0 errors
First / Last seen
2025-09-21 09:13 · 2025-09-21 09:13
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CZ.CZNET · Telefonica O2 Czech Republic, a.s.
Top geo
Czechia · Prague · Prague
Window / Updated
2025-09-15 → 2025-09-22 · Updated 2026-01-14 · v2
Open report →

80.188.30.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
80.188.30.0
Broadcast
80.188.30.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.0985 , 14.4524
Hits / Errors
1 hits · 0 errors
First / Last seen
2025-08-10 14:01 · 2025-08-10 14:01
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CZ.CZNET · O2 Czech Republic
Top geo
Czechia · Prague · Prague
Window / Updated
2025-08-04 → 2025-08-11 · Updated 2026-01-14 · v2
Open report →

90.176.169.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
90.176.169.0
Broadcast
90.176.169.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.0471 , 14.4523
Hits / Errors
1 hits · 0 errors
First / Last seen
2025-05-08 12:33 · 2025-05-08 12:33
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CZ.CZNET · Telefonica O2 Czech Republic, a.s.
Top geo
Czechia · Prague · Prague
Window / Updated
2025-05-05 → 2025-05-12 · Updated 2026-01-14 · v2
Open report →

88.103.173.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
88.103.173.0
Broadcast
88.103.173.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.0883 , 14.4124
Hits / Errors
1 hits · 0 errors
First / Last seen
2025-04-25 05:25 · 2025-04-25 05:25
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CZ.CZNET · O2 Czech Republic
Top geo
Czechia · Prague · Prague
Window / Updated
2025-04-21 → 2025-04-28 · Updated 2026-01-14 · v2
Open report →

90.177.198.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
90.177.198.0
Broadcast
90.177.198.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
49.3503 , 16.0186
Hits / Errors
1 hits · 0 errors
First / Last seen
2025-04-21 03:11 · 2025-04-21 03:11
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CZ.CZNET · Telefonica O2 Czech Republic, a.s.
Top geo
Czechia · Kraj Vysočina · Velké Meziříčí
Window / Updated
2025-04-21 → 2025-04-28 · Updated 2026-01-14 · v2
Open report →

90.183.144.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
90.183.144.0
Broadcast
90.183.144.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.0471 , 14.4523
Hits / Errors
1 hits · 0 errors
First / Last seen
2025-04-06 22:08 · 2025-04-06 22:08
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CZ.CZNET · O2 Czech Republic
Top geo
Czechia · Prague · Prague
Window / Updated
2025-03-31 → 2025-04-07 · Updated 2026-01-14 · v2
Open report →

88.101.212.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
88.101.212.0
Broadcast
88.101.212.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.0766 , 14.4464
Hits / Errors
1 hits · 0 errors
First / Last seen
2025-04-01 05:53 · 2025-04-01 05:53
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CZ.CZNET · Telefonica O2 Czech Republic, a.s.
Top geo
Czechia · Prague · Prague
Window / Updated
2025-03-31 → 2025-04-07 · Updated 2026-01-14 · v2
Open report →

88.101.93.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
88.101.93.0
Broadcast
88.101.93.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.4363 , 15.4625
Hits / Errors
1 hits · 0 errors
First / Last seen
2025-03-21 15:24 · 2025-03-21 15:24
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CZ.CZNET · Telefonica O2 Czech Republic, a.s.
Top geo
Czechia · Královéhradecký kraj · Lužany
Window / Updated
2025-03-17 → 2025-03-24 · Updated 2026-01-14 · v2
Open report →

88.100.231.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
88.100.231.0
Broadcast
88.100.231.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.0687 , 14.3947
Hits / Errors
1 hits · 0 errors
First / Last seen
2025-03-02 11:34 · 2025-03-02 11:34
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CZ.CZNET · Telefonica O2 Czech Republic, a.s.
Top geo
Czechia · Prague · Prague
Window / Updated
2025-02-24 → 2025-03-03 · Updated 2026-01-14 · v2
Open report →

88.100.39.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
88.100.39.0
Broadcast
88.100.39.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
49.8792 , 18.3709
Hits / Errors
1 hits · 0 errors
First / Last seen
2025-02-17 18:24 · 2025-02-17 18:24
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CZ.CZNET · Telefonica O2 Czech Republic, a.s.
Top geo
Czechia · Moravskoslezský kraj · Bohumín
Window / Updated
2025-02-17 → 2025-02-24 · Updated 2026-01-14 · v2
Open report →

90.180.137.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
90.180.137.0
Broadcast
90.180.137.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.2336 , 12.8695
Hits / Errors
1 hits · 0 errors
First / Last seen
2024-02-01 17:22 · 2024-02-01 17:22
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CZ.CZNET · O2 Czech Republic, a.s.
Top geo
Czechia · Karlovarský kraj · Karlovy Vary
Window / Updated
2024-01-29 → 2024-02-05 · Updated 2026-01-14 · v2
Open report →