Sh4mefulIP Address: 45.11.229.129
IP address 45.11.229.129 is registered to RIPE Network Coordination Centre and geolocates to Frankfurt am Main, Germany. 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. Its reverse DNS resolves to 129.229.11.45.in-addr.arpa. Network context: this address sits within RIPE (RIPE Network Coordination Centre), a network sh4meful has observed producing 96 failures across 58 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:
- DE Germany
- Region:
- Hesse
- City:
- Frankfurt am Main
- Coordinates:
- 50.1169, 8.6837
WHOIS Information
- Network Name:
- RIPE
- CIDR:
45.11.160.0/19, 45.11.144.0/20, 45.11.192.0/18, 45.12.0.0/14- Owner:
- RIPE Network Coordination Centre
- Org ID:
RIPE- Address:
- P.O. Box 10096, Amsterdam, 1001EB
- Reverse DNS:
-
129.229.11.45.in-addr.arpa
Last updated: 6/26/2026
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 reverse DNS record (129.229.11.45.in-addr.arpa) matches a generic ISP address pattern, typical of consumer or small-business connections rather than dedicated mail infrastructure. Mail originating from addresses like this is frequently associated with compromised endpoints, such as home routers, IoT devices, or infected personal computers being used as part of a botnet.
Geolocation places the host in Frankfurt am Main, Germany, on infrastructure operated by RIPE Network Coordination Centre. Abuse-reporting channels in this jurisdiction are generally responsive, and reports to the network operator can result in timely remediation.
The address is registered to RIPE Network Coordination Centre (RIPE), an enterprise network operator. Concentrated authentication failures on enterprise address space can indicate either a compromised internal host being used as an unauthorized sending relay, or an organization knowingly or unknowingly operating as a spam source.
Across the wider RIPE network, 58 distinct IPs have been associated with 96 authentication failures over 130 observed messages, spanning 21 countries. Most observed IPs on this network contribute to the failure count, suggesting the range as a whole warrants elevated scrutiny.
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 RIPE Network Coordination Centre is listed in RIPE WHOIS records, and timely remediation is achievable through that channel.
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.