Slack webhook - Which IPs should I open?

webhooks slack-api slack
Sahar Menashe picture Sahar Menashe · Aug 4, 2016 · Viewed 14.4k times · Source

We want to use Slack Webhook (Outgoing Webhook) with an internal web service.

Our company is behind a firewall, so outside connections must be whitelisted.

It appears that Slack has multiple addresses it will send the API request from, and they don't seem to be documented.

Which IPs/Ports should we open in the firewall (whitelist) in order to allow slack's outgoing webhooks to connect to our internal web service?

Answer

Erik Kalkoken picture Erik Kalkoken · Nov 8, 2017

An alternative could be using a VPN tunnel service to expose your internal webserver the Internet, e.g. with ngrok. I can confirm it works with Slack (I use it every day for Slack developing) and its also recommended as solution for a local development environment in the Slack tutorials.

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