Sh4mefulIP Address: 199.249.190.10
Dormant. IP address 199.249.190.10 is registered to Greenville County Library System and geolocates to Greenville, United States. It first appeared in sh4meful's dataset on September 4, 2025 and was most recently observed on October 2, 2025. Over the observation window, it has failed DMARC alignment 6 times, targeting one sender domain. Its reverse DNS resolves to smtp.greenvillelibrary.org. Network context: this address sits within SC-GVLLIB (Greenville County Library System), a network sh4meful has observed producing 6 failures across 1 distinct IP during the same window.
Failure Activity Over Time
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:
- US United States
- Region:
- South Carolina
- City:
- Greenville
- Coordinates:
- 34.8627, -82.3186
WHOIS Information
- Network Name:
- SC-GVLLIB
- CIDR:
199.249.190.0/24- Owner:
- Greenville County Library System
- Org ID:
GCLS-6- Address:
- 25 Heritage Green Plac, Greenville, SC 29601
- Reverse DNS:
-
smtp.greenvillelibrary.org
Last updated: 2/5/2026
Analysis
This IP generated DMARC authentication failures across 6 messages between September 4, 2025 and October 2, 2025, showing low but persistent activity. Every message observed from this source failed both SPF and DKIM verification. Receiving mail providers took no enforcement action beyond reporting, indicating the sending domain's DMARC policy is set to p=none.
The reverse DNS record (smtp.greenvillelibrary.org) suggests the host is configured as mail infrastructure. In the context of authentication failures, this most often indicates either a misconfigured legitimate sender or a compromised mail server being used to relay abuse.
Geolocation places the host in Greenville, United States, on infrastructure operated by Greenville County Library System. 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 Greenville County Library System (SC-GVLLIB). 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 SC-GVLLIB network, 1 distinct IP has been associated with 6 authentication failures over 6 observed messages, spanning 1 country. Activity on this network is sparse in this dataset, suggesting isolated rather than systematic abuse.
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 none enforcement action is doing its job.
Your DMARC policy posture matters more than any IP-level response here. A p=none policy provides visibility but no enforcement, meaning mail is reported but not blocked. Moving to p=quarantine and then p=reject 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 Greenville County Library System is listed in ARIN 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.