Microsoft Azure uses 369 prefixes for AzureTrafficManager.
Short answer
Microsoft Azure lists these prefixes under “AzureTrafficManager”. Microsoft publishes Azure’s ranges weekly as Service Tags: named groups such as AzureCloud, Storage, Sql or AzureFrontDoor.Frontend, each a list of prefixes. We import the global (non-regional) tags.
Prefixes
What changed
No prefixes added or removed since we started tracking this list. Changes appear here the day after the provider publishes them.
Allowlist formats
nginx (first 5 prefixes)
allow 104.208.140.215/32; allow 104.208.141.227/32; allow 104.208.141.243/32; allow 104.208.141.35/32; allow 104.208.141.76/32; deny all;
iptables (first 5 prefixes)
iptables -A INPUT -s 104.208.140.215/32 -j ACCEPT iptables -A INPUT -s 104.208.141.227/32 -j ACCEPT iptables -A INPUT -s 104.208.141.243/32 -j ACCEPT iptables -A INPUT -s 104.208.141.35/32 -j ACCEPT iptables -A INPUT -s 104.208.141.76/32 -j ACCEPT
Generate the full list from the CSV, and refresh it on a schedule: providers add and retire prefixes often.
Sources
- Microsoft Azure: published IP ranges · checked 5 Nov 2026
- Microsoft Azure documentation