IP Address: 121.131.220.152


Threat level: 61%
Attack count: 617
Country: South Korea
Region: Seoul
City: Seoul
ASN: 4766
ISP: Korea Telecom
Net Block: 121.131.218.0-121.133.40.255
Domain name: kt.com
Abuse contact: [email protected]
Stats (UTC)

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Recent submissions


« ‹ 0 1 2 › »
Reported by
Timestamp
Notes
Flags
System
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
✅ Gordon
ipban 2.0.0
BruteForce
SMTP
fail2ban
BruteForce
postfix
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
fail2ban
BruteForce
tesi_postfix-auth
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
✅ Anonymous
Real-time Intercept: SMTP attack. Reference: 2026-06-21 04:44:09.1222 Login failure: 121.131.220.152 SMTP
BruteForce, Hacking
SMTP
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
✅ Anonymous
Real-time Intercept: SMTP attack. Reference: 2026-06-19 06:27:24.6944 Login failure: 121.131.220.152 SMTP
BruteForce, Hacking
SMTP
✅ Anonymous
Real-time Intercept: SMTP attack. Reference: 2026-06-17 07:32:51.9684 Login failure: 121.131.220.152 SMTP
BruteForce, Hacking
SMTP
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
fail2ban
BruteForce
postfix
✅ tuya
ipban 1.9.0 - Authentication failed
BruteForce
SmarterMail
fail2ban
BruteForce
tesi_postfix-auth
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
fail2ban
BruteForce
postfix
✅ Craig
ipban 2.0.0 - Invalid Username or Password
BruteForce
MailEnable
✅ Gordon
ipban 2.0.0
BruteForce
SMTP
ipban 1.8.0 - 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
✅ Gordon
ipban 2.0.0
BruteForce
SMTP
fail2ban
BruteForce
postfix
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
✅ Anonymous
Real-time Intercept: SMTP attack. Reference: 2026-06-04 15:38:44.1182 Login failure: 121.131.220.152 SMTP
BruteForce, Hacking
SMTP
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
ipbanpro 5.0.0
BruteForce
IceWarp
fail2ban persistent attacker 120+ days recurring abuse
BruteForce
SMTP
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
fail2ban
BruteForce
tesi_postfix-auth
✅ Anonymous
Real-time Intercept: SMTP attack. Reference: 2026-05-30 13:47:04.9354|WARN|Login failure: 121.131.220.152, , SMTP, 1,
BruteForce
SMTP
✅ Craig
ipban 2.0.0 - Invalid Username or Password
BruteForce
MailEnable
ipbanpro 5.0.0
BruteForce
IceWarp
✅ Gordon
ipban 2.0.0
BruteForce
SMTP
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
✅ Anonymous
Real-time Intercept: SMTP attack. Reference: 2026-05-22 10:18:48.0400 Login failure: 121.131.220.152 SMTP 2
BruteForce
SMTP
fail2ban
BruteForce
tesi_postfix-auth
✅ Anonymous
Real-time Intercept: SMTP attack. Reference: 2026-05-21 12:20:48.0690 Login failure: 121.131.220.152 SMTP
BruteForce
SMTP
✅ Anonymous
Real-time Intercept: SMTP attack. Reference: 2026-05-20 14:49:50.0817 Login failure: 121.131.220.152 SMTP
BruteForce
SMTP
✅ tuya
ipban 1.9.0 - Authentication failed
BruteForce
SmarterMail
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
✅ Anonymous
SMTP attack detected. 2026-05-17 04:04:56.5615 Login failure: 121.131.220.152 SMTP
BruteForce
SMTP
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
✅ Anonymous
SMTP attack detected. 2026-05-16 06:08:31.8017 Login failure: 121.131.220.152 SMTP
BruteForce
SMTP
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
✅ Craig
ipban 2.0.0 - Invalid Username or Password
BruteForce
MailEnable
✅ Anonymous
SMTP attack detected. 2026-05-15 06:25:56.6605 Login failure: 121.131.220.152 SMTP
BruteForce
SMTP
fail2ban
BruteForce
tesi_postfix-auth
✅ Gordon
ipban 2.0.0
BruteForce
SMTP
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
✅ Anonymous
SMTP attack detected. 2026-05-12 07:14:20.7045 Login failure: 121.131.220.152 SMTP
BruteForce
SMTP
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
✅ Anonymous
SMTP attack detected. 2026-05-10 07:36:23.1537 Login failure: 121.131.220.152 SMTP
BruteForce
SMTP
fail2ban
BruteForce
postfix
✅ Anonymous
SMTP attack detected. 2026-05-09 03:20:22.7092 Login failure: 121.131.220.152 SMTP
None
SMTP
✅ 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
postfix
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
fail2ban
BruteForce
postfix
✅ 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
✅ tuya
ipban 1.9.0 - Authentication failed
BruteForce
SmarterMail
✅ Gordon
ipban 2.0.0
BruteForce
SMTP
fail2ban
BruteForce
postfix
✅ 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
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
✅ Craig
ipban 2.0.0 - Invalid Username or Password
BruteForce
MailEnable
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
fail2ban
BruteForce
tesi_postfix-auth
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
fail2ban
BruteForce
postfix
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
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
fail2ban
BruteForce
tesi_postfix-auth
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
✅ Chris
ipban 3.1.0 - Invalid Username or Password
BruteForce
MailEnable
fail2ban
BruteForce
postfix
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
ipban 1.8.0 - LogonDenied
BruteForce
MSExchangeLogs
« ‹ 0 1 2 › »
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