Sh4mefulIP Address: 113.191.208.170
IP address 113.191.208.170 is registered to VNPT and geolocates to Ninh Bình, Vietnam. It was observed in sh4meful's dataset on June 25, 2026. Over the observation window, it has failed DMARC alignment once, targeting one sender domain. It has no reverse DNS record. Network context: this address sits within VNPT-VN (VNPT), a network sh4meful has observed producing 23 failures across 15 distinct IPs during the same window.
Failure Activity Over Time
Peak activity was observed in the week of June 22, 2026 with 1 failures recorded. Activity in the most recent 30-day window increased sharply compared with the prior period (1 vs 0 failures).
This IP has claimed to send from 1 sender domain monitored by sh4meful. The single targeted domain suggests either a compromised sending source or a spoofing attempt focused on a specific brand.
This page shows DMARC authentication failure data for this IP address. Learn more about this data.
Geolocation Information
- Country:
- VN Vietnam
- Region:
- Ninh Bình Province
- City:
- Ninh Bình
- Coordinates:
- 20.253, 105.9749
WHOIS Information
- Network Name:
- VNPT-VN
- CIDR:
113.160.0.0/11- Owner:
- VNPT
Analysis
This IP was observed generating a single DMARC authentication failure on June 25, 2026. With only one data point, the event is better read as a single suspicious observation than a sustained campaign. Every message observed from this source failed both SPF and DKIM verification. Receiving mail providers applied a reject disposition, refusing delivery outright.
The address has no reverse DNS record. Legitimate mail infrastructure almost always publishes a PTR record, because major receivers (Gmail, Microsoft 365, Yahoo) penalize or reject mail without one, and because it is a baseline operational hygiene expectation. Its absence, combined with authentication failure, is consistent with a host being used to originate spoofed mail rather than one misconfigured by a legitimate operator.
Geolocation places the host in Ninh Bình, Vietnam, on infrastructure operated by VNPT. Abuse-reporting channels exist in this jurisdiction but historical response rates are inconsistent, meaning remediation is more often handled through receiver-side blocking than provider-side takedown.
The address is registered to VNPT (VNPT-VN). Enterprise-registered addresses that appear in DMARC failure data are typically either compromised hosts on the organization's network or outbound mail relays that are not properly authorized in the domain's SPF record.
Across the wider VNPT-VN network, 15 distinct IPs have been associated with 23 authentication failures over 39 observed messages, spanning 1 country. The failure pattern suggests a mix of abuse sources on this network.
If your domain appears in the From header of mail from this address, treat it as probable spoofing. Verify that your SPF record does not authorize this host, directly or through nested include mechanisms, and that no DKIM selector you publish has been issued to it. If both checks come back clean, the receiver's reject action is doing its job.
Your DMARC policy posture matters more than any IP-level response here. The enforcement action applied to this mail indicates your policy is already providing protection. Maintaining p=reject across all your domains closes the gap for attackers who manage partial alignment. Domains that remain at p=none long-term tend to be impersonated repeatedly, because the cost to the attacker of attempting is effectively zero.
Blocking this individual address has limited durability: an attacker can rotate to another address in the same /24 subnet at effectively zero cost. More durable responses include monitoring aggregate DMARC reports so new sources are visible as they emerge, tightening SPF to remove overly permissive include chains or +all mechanisms, and ensuring DKIM is signing every legitimate outbound stream so alignment failures are unambiguous. The formal abuse contact for VNPT is listed in APNIC WHOIS records, though response rates from this jurisdiction are inconsistent.
External Reputation Lookups
Look up this IP in external threat intelligence and reputation databases (opens in new tab):
Recommended Action
If this IP appears in your own DMARC reports, treat it as an unauthorized sender unless you have specifically verified it as a legitimate service you use. Ensure your DMARC policy is at p=quarantine or p=reject to prevent delivery of messages this IP claims to send from your domain. If you're new to DMARC, our complete guide walks through the mechanics.