What IPs does Twilio use for Status Updates


What IPs does Twilio use for Status Updates

What IPs does Twilio use for Status Updates

Posted on Oct 21, 2014 by Paul White

Twilio is a great service for developers who want to integrate SMS, MMS, and voice features to their websites and applications.  One of the great things that twilio does is provide status updates on the messages you send. Letting you know if they are Queued, Sending, Sent, or Delivered.  However these status updates come from a Proxy that is Cloud Hosted, and does not originate from any specific IP or block of IPs.  When I submitted a ticket to Twilio asking for the IP blocks they use, they said there are no set of IPs used, and that they are constantly changing.  

For me this is a problem.  I run a very thick firewall, with over a dozen rouge countries blocked, plus any botnet, or hacker is instantly added to my firewall.  For Datacenters that seem to harbor these low lifes, I have looked up their IP blocks and firewalled the entire datacenter.  These precations have gone a long way to eliminate the amount of mail and form spam that would usually waste both mine and my client's time.

However After a little digging through my Access Logs I have been able to compile a list of IPs that Twilio has used to access my server.  Hopefully these will help others who need at least something they can whitelist on their firewall for twilio.  Seems they are using cloud hosting services by Amazon.com and Amazon AWS.  Most of the requests come from the 54.0.0.0/8 Block, and a few from 23.0.0.0/8 block.  

This is great as know I know which IPs to whitelist on my server,  but its also bad because in my experience Amazon AWS tends to harbor spam bots and comment spammers.  At one point I completely firewalled their known IP blocks.

List of Known IPs used by Twilio

IP AddressVisits
54.226.127.24129
54.204.212.11728
54.196.162.3327
54.196.41.20826
54.90.253.21226
54.91.34.9326
54.242.129.9024
50.16.20.21523
54.198.243.7222
50.19.40.23922
23.22.134.4122
107.21.186.21120
54.237.20.1404
54.243.15.1253
54.81.0.483
54.83.105.403
54.81.84.692
54.224.106.962
54.197.108.1462
54.224.170.1052
54.226.145.1982
54.205.205.1902
54.224.153.362
54.211.184.2001
54.205.56.1311
54.242.98.2521
54.237.96.2451
54.234.134.2471
54.81.176.1601
50.17.78.1201
54.226.207.911
23.20.94.821
54.80.102.2101
23.22.61.141

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