IP Address: 123.13.71.172

Threat level: 2%

Attack count: 21

Country: China

ASN: 4837

ISP: CHINA UNICOM China169 Backbone

Net Block: 123.4.0.0-123.15.255.255

Domain name: chinaunicom.cn

Stats (UTC)

Reported by

Timestamp

Notes

Flags

System

✅ Anonymous

9 days ago

Real-time Intercept: SMTP attack. Reference: 2026-05-22 20:10:36.6132 Login failure: 123.13.71.172 SMTP

BruteForce

SMTP

✅ Chris

10 days ago

ipban 3.1.0 - Invalid Username or Password

BruteForce

MailEnable

✅ Gordon

11 days ago

ipban 2.0.0

BruteForce

SMTP

✅ Arvoreen

11 days ago

fail2ban

BruteForce

postfix

✅ tuya

11 days ago

ipban 1.9.0 - Authentication failed

BruteForce

SmarterMail

11 days ago

fail2ban

BruteForce

tesi_postfix-auth