171.231.228.21
Classification: Malicious
171.231.228.21 is a malicious IP address in Nam Dinh, VN. 3 sightings from Barracuda and Rapid7 Open Data (Mail Spammer), last seen 2026-10-17.
Current activity
- Known attacker — Seen launching attacks over the Internet.
Blacklist sightings
| Description | Source | First seen | Last seen | Labels | MITRE ATT&CK |
|---|---|---|---|---|---|
| Mail Spammer | Barracuda | 2019-09-01 19:55:11 | 2026-10-17 16:29:49 | attacker malicious-activity | |
| NTP Open Resolver | Rapid7 Open Data | 2019-08-05 02:55:20 | 2019-08-05 02:55:20 |
Tags
ntp reflection amplification open resolver monlistWhois information
- AS name
- AS7552 Viettel Group
- AS registry
- apnic
- AS date
- 2011-03-04 00:00:00
- AS CIDR
- 171.231.224.0/21
- CIDR
- 171.224.0.0/11
- Registrant
- Viettel Group
- Address
- Ha Noi, VietNam
- City
- Nam Dinh
- Country
- VN — Viet Nam 🇻🇳
- Contact email
- [email protected], [email protected]
- First indexed
- 2019-08-05 02:55:20
- Last updated
- 2026-10-17 16:29:50
Malicious IPs in the same CIDR
171.231.226.31 171.231.227.40 171.231.225.40 171.231.226.65 171.231.230.20 171.231.231.53 171.231.224.49 171.231.226.94 171.231.228.21 171.231.225.83 171.231.230.48 171.231.228.7