IP Address: 121.165.36.99


Threat level: 4%
Attack count: 72
Country: South Korea
Region: Gyeonggi-do
City: Yongin-si
ASN: 4766
ISP: Korea Telecom
Net Block: 121.164.117.0-121.168.8.255
Domain name: kt.com
Abuse contact: [email protected]
Stats (UTC)

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Recent submissions


Reported by
Timestamp
Notes
Flags
System
ipban 4.1.0 - LogonDenied
BruteForce
MSExchangeLogs
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
ipban 4.1.0 - LogonDenied
BruteForce
MSExchangeLogs
ipban 4.1.0 - LogonDenied
BruteForce
MSExchange
ipban 4.1.0 - LogonDenied
BruteForce
MSExchangeLogs
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
ipban 4.1.0 - LogonDenied
BruteForce
MSExchange
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
fail2ban
BruteForce
tesi_postfix-auth
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
ipban 4.1.0 - LogonDenied
BruteForce
MSExchangeLogs
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
ipban 4.1.0 - LogonDenied
BruteForce
MSExchange
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
✅ Anonymous
ipbanpro 5.0.0 - Invalid Username or Password
BruteForce
MailEnable
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
fail2ban
BruteForce
tesi_postfix-auth
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
✅ Craig
ipban 2.0.0 - Invalid Username or Password
BruteForce
MailEnable
fail2ban
BruteForce
tesi_postfix-auth
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
✅ Anonymous
ipbanpro 5.0.0 - Invalid Username or Password
BruteForce
MailEnable
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
fail2ban
BruteForce
postfix
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
fail2ban
BruteForce
tesi_postfix-auth
fail2ban
BruteForce
tesi_postfix-auth
✅ Anonymous
Real-time Intercept: SMTP attack. Reference: 2026-06-18 16:43:37.3996 Login failure: 121.165.36.99 SMTP
BruteForce, Hacking
SMTP
✅ Anonymous
ipbanpro 5.0.0 - Invalid Username or Password
BruteForce
MailEnable
fail2ban
BruteForce
postfix
✅ Anonymous
Real-time Intercept: SMTP attack. Reference: 2026-06-04 06:57:10.1784 Login failure: 121.165.36.99 SMTP
BruteForce, Hacking
SMTP
ipbanpro 5.0.0
BruteForce
IceWarp
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
✅ Anonymous
ipban 2.0.0 - Authentication failed
BruteForce
SmarterMail_SMTP
✅ Anonymous
ipban 3.0.0 - Invalid Username or Password
BruteForce
MailEnable
fail2ban
BruteForce
postfix
fail2ban
BruteForce
tesi_postfix-auth
ipban 2.0.1 - Invalid Username or Password
BruteForce
MailEnable
ipbanpro 4.2.0
BruteForce
MailEnable
ipbanpro 4.2.0
BruteForce
MailEnable
ipbanpro 4.2.0
BruteForce
MailEnable
ipbanpro 4.2.0
BruteForce
MailEnable
ipbanpro 4.1.0 - ipban failed login
BruteForce
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
ipbanpro 4.1.0
BruteForce
MailEnable
ipbanpro 4.0.0
BruteForce
MailEnable
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
ipbanpro 3.4.0
BruteForce
MailEnable
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
✅ Craig
ipban 2.0.0 - Invalid Username or Password
BruteForce
MailEnable
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
✅ tuya
ipban 1.9.0 - Authentication failed
BruteForce
SmarterMail
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
✅ tuya
ipban 1.9.0 - Authentication failed
BruteForce
SmarterMail
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
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