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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: O2 Czech Republic, a.s. · Clear
Snapshot 2026-03-08 Results 26 Page 1 / 1

109.81.125.0/24

Risk Max — LOW Footprint 0.391% Hits 3
Prefix / IP version
/24 · IPv4
Network
109.81.125.0
Broadcast
109.81.125.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
49.978100000000005 , 16.3865
Hits / Errors
3 hits · 0 errors
First / Last seen
2026-02-26 02:00 · 2026-02-27 02:00
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
— · FIX BB Czechia-vl
Top geo
Czechia · Pardubický kraj · Ústí nad Orlicí
Window / Updated
2026-02-23 → 2026-03-02 · Updated 2026-03-03 · v2
Open report →

213.211.52.0/24

Risk Max — LOW Footprint 0.391% Hits 3
Prefix / IP version
/24 · IPv4
Network
213.211.52.0
Broadcast
213.211.52.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
48.8519 , 16.0465
Hits / Errors
3 hits · 0 errors
First / Last seen
2026-02-24 02:00 · 2026-02-25 02:00
Top ASN
AS12570 · O2 Czech Republic, a.s.
Top organization / ISP
LANservis s.r.o · CZECHBONE
Top geo
Czechia · South Moravian · Znojmo
Window / Updated
2026-02-23 → 2026-03-02 · Updated 2026-03-03 · v2
Open report →

109.81.123.0/24

Risk Max — LOW Footprint 0.391% Hits 3
Prefix / IP version
/24 · IPv4
Network
109.81.123.0
Broadcast
109.81.123.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
49.978100000000005 , 16.3865
Hits / Errors
3 hits · 0 errors
First / Last seen
2026-02-23 02:00 · 2026-02-24 02:00
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
— · FIX BB Czechia-vl
Top geo
Czechia · Pardubický kraj · Ústí nad Orlicí
Window / Updated
2026-02-23 → 2026-03-02 · Updated 2026-03-03 · v2
Open report →

109.81.27.0/24

Risk Max — LOW Footprint 0.391% Hits 3
Prefix / IP version
/24 · IPv4
Network
109.81.27.0
Broadcast
109.81.27.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.076600000000006 , 14.446400000000002
Hits / Errors
3 hits · 0 errors
First / Last seen
2026-02-23 02:00 · 2026-02-24 02:00
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CZ.CZNET · O2 Czech Republic
Top geo
Czechia · Prague · Prague
Window / Updated
2026-02-23 → 2026-03-02 · Updated 2026-03-03 · v2
Open report →

37.188.245.0/24

Risk Max — LOW Footprint 0.391% Hits 2
Prefix / IP version
/24 · IPv4
Network
37.188.245.0
Broadcast
37.188.245.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.0766 , 14.4464
Hits / Errors
2 hits · 0 errors
First / Last seen
2026-02-23 02:00 · 2026-02-24 02:00
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
Cgnat O2 CZ · O2 Czech Republic, a.s.
Top geo
Czechia · Prague · Prague
Window / Updated
2026-02-23 → 2026-03-02 · Updated 2026-03-03 · v2
Open report →

109.81.19.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
109.81.19.0
Broadcast
109.81.19.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.1242 , 14.398
Hits / Errors
1 hits · 0 errors
First / Last seen
2026-03-01 02:00 · 2026-03-02 02:00
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CZ.CZNET · O2 Czech Republic
Top geo
Czechia · Prague · Prague
Window / Updated
2026-02-23 → 2026-03-02 · Updated 2026-03-03 · v2
Open report →

90.181.74.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
90.181.74.0
Broadcast
90.181.74.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.7722 , 14.9556
Hits / Errors
1 hits · 0 errors
First / Last seen
2026-02-28 02:00 · 2026-03-01 02:00
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CZ.CZNET · Telefonica O2 Czech Republic, a.s.
Top geo
Czechia · Liberecký kraj · Liberec
Window / Updated
2026-02-23 → 2026-03-02 · Updated 2026-03-03 · v2
Open report →

109.81.171.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
109.81.171.0
Broadcast
109.81.171.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.0766 , 14.4464
Hits / Errors
1 hits · 0 errors
First / Last seen
2026-02-27 02:00 · 2026-02-28 02:00
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CGN FIX Broadband Praha-vl · O2 Czech Republic a.s.
Top geo
Czechia · Prague · Prague
Window / Updated
2026-02-23 → 2026-03-02 · Updated 2026-03-03 · v2
Open report →

90.177.144.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
90.177.144.0
Broadcast
90.177.144.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.0766 , 14.4464
Hits / Errors
1 hits · 0 errors
First / Last seen
2026-02-27 02:00 · 2026-02-28 02:00
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
2026-02-23 → 2026-03-02 · Updated 2026-03-03 · v2
Open report →

90.180.80.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
90.180.80.0
Broadcast
90.180.80.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.0766 , 14.4464
Hits / Errors
1 hits · 0 errors
First / Last seen
2026-02-27 02:00 · 2026-02-28 02:00
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
2026-02-23 → 2026-03-02 · Updated 2026-03-03 · v2
Open report →

90.183.251.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
90.183.251.0
Broadcast
90.183.251.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.137 , 14.7309
Hits / Errors
1 hits · 0 errors
First / Last seen
2026-02-27 02:00 · 2026-02-28 02:00
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
— · CZ.CZNET
Top geo
Czechia · Central Bohemia · Nehvizdy
Window / Updated
2026-02-23 → 2026-03-02 · Updated 2026-03-03 · v2
Open report →

109.81.6.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
109.81.6.0
Broadcast
109.81.6.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.0766 , 14.4464
Hits / Errors
1 hits · 0 errors
First / Last seen
2026-02-26 02:00 · 2026-02-27 02:00
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
— · CZ.CZNET
Top geo
Czechia · Prague · Prague
Window / Updated
2026-02-23 → 2026-03-02 · Updated 2026-03-03 · v2
Open report →

109.81.26.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
109.81.26.0
Broadcast
109.81.26.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.0766 , 14.4464
Hits / Errors
1 hits · 0 errors
First / Last seen
2026-02-25 02:00 · 2026-02-26 02:00
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CZ.CZNET · O2 Czech Republic
Top geo
Czechia · Prague · Prague
Window / Updated
2026-02-23 → 2026-03-02 · Updated 2026-03-03 · v2
Open report →

109.81.92.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
109.81.92.0
Broadcast
109.81.92.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.0687 , 14.3947
Hits / Errors
1 hits · 0 errors
First / Last seen
2026-02-25 02:00 · 2026-02-26 02:00
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
2026-02-23 → 2026-03-02 · Updated 2026-03-03 · v2
Open report →

109.81.95.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
109.81.95.0
Broadcast
109.81.95.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.0687 , 14.3947
Hits / Errors
1 hits · 0 errors
First / Last seen
2026-02-25 02:00 · 2026-02-26 02:00
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
2026-02-23 → 2026-03-02 · Updated 2026-03-03 · v2
Open report →

85.193.2.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
85.193.2.0
Broadcast
85.193.2.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
49.1953 , 16.6016
Hits / Errors
1 hits · 0 errors
First / Last seen
2026-02-25 02:00 · 2026-02-26 02:00
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
Internethome Losan · O2 Czech Republic
Top geo
Czechia · South Moravian · Brno
Window / Updated
2026-02-23 → 2026-03-02 · Updated 2026-03-03 · v2
Open report →

85.193.33.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
85.193.33.0
Broadcast
85.193.33.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
49.1953 , 16.6016
Hits / Errors
1 hits · 0 errors
First / Last seen
2026-02-25 02:00 · 2026-02-26 02:00
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
Internethome Losan · O2 Czech Republic
Top geo
Czechia · South Moravian · Brno
Window / Updated
2026-02-23 → 2026-03-02 · Updated 2026-03-03 · v2
Open report →

85.71.26.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
85.71.26.0
Broadcast
85.71.26.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
49.1953 , 16.6016
Hits / Errors
1 hits · 0 errors
First / Last seen
2026-02-25 02:00 · 2026-02-26 02:00
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
xDSL services · Telefonica O2 Czech Republic, a.s.
Top geo
Czechia · South Moravian · Brno
Window / Updated
2026-02-23 → 2026-03-02 · Updated 2026-03-03 · v2
Open report →

109.81.126.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
109.81.126.0
Broadcast
109.81.126.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
49.9781 , 16.3865
Hits / Errors
1 hits · 1 errors
First / Last seen
2026-02-24 02:00 · 2026-02-25 02:00
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
— · FIX BB Czechia-vl
Top geo
Czechia · Pardubický kraj · Ústí nad Orlicí
Window / Updated
2026-02-23 → 2026-03-02 · Updated 2026-03-03 · v2
Open report →

109.81.163.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
109.81.163.0
Broadcast
109.81.163.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.0883 , 14.4124
Hits / Errors
1 hits · 0 errors
First / Last seen
2026-02-24 02:00 · 2026-02-25 02:00
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CGN FIX Broadband Praha-vl · O2 Czech Republic a.s.
Top geo
Czechia · Prague · Prague
Window / Updated
2026-02-23 → 2026-03-02 · Updated 2026-03-03 · v2
Open report →

109.81.31.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
109.81.31.0
Broadcast
109.81.31.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.0948 , 14.4785
Hits / Errors
1 hits · 0 errors
First / Last seen
2026-02-23 02:00 · 2026-02-24 02:00
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CZ.CZNET · O2 Czech Republic
Top geo
Czechia · Prague · Prague
Window / Updated
2026-02-23 → 2026-03-02 · Updated 2026-03-03 · v2
Open report →

109.81.120.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
109.81.120.0
Broadcast
109.81.120.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
49.9781 , 16.3865
Hits / Errors
1 hits · 0 errors
First / Last seen
2026-02-22 02:00 · 2026-02-23 02:00
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
— · FIX BB Czechia-vl
Top geo
Czechia · Pardubický kraj · Ústí nad Orlicí
Window / Updated
2026-02-23 → 2026-03-02 · Updated 2026-03-03 · v2
Open report →

109.81.121.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
109.81.121.0
Broadcast
109.81.121.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
49.9781 , 16.3865
Hits / Errors
1 hits · 0 errors
First / Last seen
2026-02-22 02:00 · 2026-02-23 02:00
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
— · FIX BB Czechia-vl
Top geo
Czechia · Pardubický kraj · Ústí nad Orlicí
Window / Updated
2026-02-23 → 2026-03-02 · Updated 2026-03-03 · v2
Open report →

109.81.166.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
109.81.166.0
Broadcast
109.81.166.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.1242 , 14.398
Hits / Errors
1 hits · 0 errors
First / Last seen
2026-02-22 02:00 · 2026-02-23 02:00
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CGN FIX Broadband Praha-vl · O2 Czech Republic a.s.
Top geo
Czechia · Prague · Prague
Window / Updated
2026-02-23 → 2026-03-02 · Updated 2026-03-03 · v2
Open report →

37.188.146.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
37.188.146.0
Broadcast
37.188.146.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
50.1155 , 14.4124
Hits / Errors
1 hits · 0 errors
First / Last seen
2026-02-22 02:00 · 2026-02-23 02:00
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
Cgnat O2 CZ · O2 Czech Republic, a.s.
Top geo
Czechia · Prague · Prague
Window / Updated
2026-02-23 → 2026-03-02 · Updated 2026-03-03 · v2
Open report →

88.100.109.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
88.100.109.0
Broadcast
88.100.109.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
49.7977 , 18.2311
Hits / Errors
1 hits · 0 errors
First / Last seen
2026-02-22 02:00 · 2026-02-23 02:00
Top ASN
AS5610 · O2 Czech Republic, a.s.
Top organization / ISP
CZ.CZNET · O2 Czech Republic, a.s.
Top geo
Czechia · Moravskoslezský kraj · Ostrava
Window / Updated
2026-02-23 → 2026-03-02 · Updated 2026-03-03 · v2
Open report →