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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: K-Opticom Corporation · Clear
Snapshot 2026-02-01 Results 7 Page 1 / 1

122.100.24.0/24

Risk Max — LOW Footprint 0.391% Hits 33
Prefix / IP version
/24 · IPv4
Network
122.100.24.0
Broadcast
122.100.24.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
35.2167 , 136.833
Hits / Errors
33 hits · 0 errors
First / Last seen
2025-08-06 06:28 · 2025-08-06 06:45
Top ASN
AS17511 · OPTAGE Inc.
Top organization / ISP
K-Opticom Corporation · OPTAGE Inc.
Top geo
Japan · Aichi · Kiyosu
Window / Updated
2025-08-04 → 2025-08-11 · Updated 2026-01-14 · v2
Open report →

180.145.206.0/24

Risk Max — LOW Footprint 0.391% Hits 16
Prefix / IP version
/24 · IPv4
Network
180.145.206.0
Broadcast
180.145.206.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
35.0231 , 135.752
Hits / Errors
16 hits · 0 errors
First / Last seen
2023-11-19 16:28 · 2023-11-19 16:28
Top ASN
AS17511 · OPTAGE Inc.
Top organization / ISP
K-Opticom Corporation · OPTAGE Inc.
Top geo
Japan · Kyoto · Kyoto
Window / Updated
2023-11-13 → 2023-11-20 · Updated 2026-01-14 · v2
Open report →

180.146.103.0/24

Risk Max — LOW Footprint 0.391% Hits 16
Prefix / IP version
/24 · IPv4
Network
180.146.103.0
Broadcast
180.146.103.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
35.0231 , 135.752
Hits / Errors
16 hits · 0 errors
First / Last seen
2023-07-09 14:55 · 2023-07-09 14:55
Top ASN
AS17511 · OPTAGE Inc.
Top organization / ISP
K-Opticom Corporation · OPTAGE Inc.
Top geo
Japan · Kyoto · Kyoto
Window / Updated
2023-07-03 → 2023-07-10 · Updated 2026-01-14 · v2
Open report →

219.75.255.0/24

Risk Max — LOW Footprint 0.391% Hits 11
Prefix / IP version
/24 · IPv4
Network
219.75.255.0
Broadcast
219.75.255.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
35.0231 , 135.752
Hits / Errors
11 hits · 0 errors
First / Last seen
2024-12-04 18:58 · 2024-12-04 18:58
Top ASN
AS17511 · OPTAGE Inc.
Top organization / ISP
K-Opticom Corporation · OPTAGE Inc.
Top geo
Japan · Kyoto · Kyoto
Window / Updated
2024-12-02 → 2024-12-09 · Updated 2026-01-14 · v2
Open report →

101.140.178.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
101.140.178.0
Broadcast
101.140.178.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
34.9915 , 135.8836
Hits / Errors
1 hits · 0 errors
First / Last seen
2025-05-10 05:59 · 2025-05-10 05:59
Top ASN
AS17511 · OPTAGE Inc.
Top organization / ISP
K-Opticom Corporation · OPTAGE Inc.
Top geo
Japan · Shiga · Ōtsu
Window / Updated
2025-05-05 → 2025-05-12 · Updated 2026-01-14 · v2
Open report →

121.81.209.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
121.81.209.0
Broadcast
121.81.209.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
34.6892 , 135.4899
Hits / Errors
1 hits · 0 errors
First / Last seen
2025-03-31 06:47 · 2025-03-31 06:47
Top ASN
AS17511 · OPTAGE Inc.
Top organization / ISP
K-Opticom Corporation · OPTAGE Inc.
Top geo
Japan · Osaka · Osaka
Window / Updated
2025-03-31 → 2025-04-07 · Updated 2026-01-14 · v2
Open report →

119.229.204.0/24

Risk Max — LOW Footprint 0.391% Hits 1
Prefix / IP version
/24 · IPv4
Network
119.229.204.0
Broadcast
119.229.204.255
Observed IPs / Subnet size
1 observed · 256 total
Centroid
34.5963 , 135.4868
Hits / Errors
1 hits · 0 errors
First / Last seen
2025-01-10 09:25 · 2025-01-10 09:25
Top ASN
AS17511 · OPTAGE Inc.
Top organization / ISP
K-Opticom Corporation · OPTAGE Inc.
Top geo
Japan · Osaka · Sakai
Window / Updated
2025-01-06 → 2025-01-13 · Updated 2026-01-14 · v2
Open report →