Sh4mefulIP Address: 159.183.224.107
Twilio SendGrid is a cloud-based Email Service Provider (ESP), or Mail Transfer Agent (MTA). It operates as a high-volume, cloud-based SMTP service to send, receive, and relay both transactional and marketing emails. These signals could be indicative of a failure during legitimate sends (through Sendgrid), or could be signal of a spam/spoof attempt using their service which is common enough we're not treating this as a confounder.
This page shows DMARC authentication failure data for this IP address. Learn more about this data.
Geolocation Information
- Country:
- US United States
- Coordinates:
- 37.751, -97.822
WHOIS Information
- Network Name:
- TWILI-11
- CIDR:
159.183.0.0/16- Owner:
- Twilio SendGrid
- Org ID:
TWILI-11- Address:
- Twilio, Inc. 375 Beale Street Suite 300, San Francisco, CA 94105
- Reverse DNS:
-
s.wfbtzhsb.outbound-mail.sendgrid.net
Last updated: 2/5/2026
Analysis
This IP was first observed on September 12, 2024 and most recently on September 25, 2025. It has been associated with 22 failed authentication events affecting 273 messages, representing significant volume. The IP belongs to TWILI-11 (Twilio SendGrid), a network with activity associated with United States. 6 other IPs in the same /24 subnet (159.183.224.*) also appear in this dataset.
Network Topology
Failures Detected from this IP
Showing 1-22 of 22 failures, affecting 273 messagesExternal Reputation Lookups
Look up this IP in external threat intelligence and reputation databases (opens in new tab):
Nearby IPs
Other IPs in the 159.183.224.0/24 range observed failing DMARC:
159.183.224.102 (282 failures), 159.183.224.100 (275 failures), 159.183.224.108 (263 failures), 159.183.224.10 (1 failure), 159.183.224.105 (1 failure), 159.183.224.109 (1 failure)