Sh4mefulIP Address: 159.183.224.100
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.wfbtzhsq.outbound-mail.sendgrid.net
Last updated: 2/5/2026
Analysis
This IP was first observed on March 12, 2024 and most recently on September 11, 2025. It has been associated with 14 failed authentication events affecting 504 messages, representing moderate activity. 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
External 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), 159.183.224.108 (263 failures), 159.183.224.107 (262 failures), 159.183.224.10 (1 failure), 159.183.224.105 (1 failure), 159.183.224.109 (1 failure)