Mail-service activity triggered Fail2Ban bans.
ip-reputation · blocklist · fail2ban · honeypots · ssh · scanning · exploitation
First observed Oct 9, 2026 · Last observed Oct 9, 2026
Reported source: CTIDAO Blocklist Feed
171.231.24.76
IPv4AS7552 · VIETEL-AS-AP - Viettel Group, VN · 171.231.24.0/21 · VN registry
What sources report
1 accessible sourceSource descriptions describe reported observations. They are not a CTIDAO verdict.
DNS history
1 observed relationships
- dynamic-ip-adsl.viettel.vn → 171.231.24.76Last observed November 2026
Exposure
Snapshot pending
Recorded observations do not establish that a port is open now.
Network
AS7552 · 171.231.24.0/21
Popularity
Not present in the current list
Popularity is neutral context, not threat evidence.
Use the evidence tabs to inspect complete observations and follow related entities. An absence of observations does not establish safety.
Public feed matches
CTIDAO Blocklist Feed10/9/2026, 3:03:10 PM
CTIDAO Blocklist Feed: Mail-service activity triggered Fail2Ban bans.
| Indicator | Type | Tag | Source | Last seen |
|---|---|---|---|---|
| 171.231.24.76 | ip | ip-reputation, blocklist, fail2ban | 2026-10-09 15:03:10 | |
CTIDAO Blocklist Feed: Mail-service activity triggered Fail2Ban bans. | ||||
DNS history
1 observations
Observed relationships do not establish maliciousness.
| Hostname | IP | Last seen | Hits | Provenance |
|---|---|---|---|---|
| dynamic-ip-adsl.viettel.vn | 171.231.24.76 | Nov 2026First seen: Nov 2026 | 1 | CTIDAO DNS |
Nov 20261 hits · CTIDAO DNS
Record details
A · First seen Nov 2026
Network ownership
BGP origin and registry data from Team Cymru.
Origin ASN
AS7552
BGP prefix
171.231.24.0/21
Registry country
VN
VIETEL-AS-AP - Viettel Group, VN
Registry country is RIR assignment data, not IP geolocation.
Checked 11/1/2026, 1:54:13 AM
Popularity
Daily link and hosting prominence from top1m.org; not a security verdict or traffic estimate.
Not present in the current Top 1M lists.
Internet exposure
Current scanner state. Times mean last observed open, not open now.
Exposure data is being refreshed.
Public preview is limited to five services and excludes banners. Account research on this IP entity includes every cached service, exact timestamps, banners, and enrichment summaries.
Account research
Take this investigation further
1 public pDNS relationships are available. Account research adds exact timing, focused pivots, and matching paid-feed intelligence.