Microsoft Azure uses 32 prefixes for SystemServiceAzureSpringAppsResourceProvider.
Short answer
Microsoft Azure lists these prefixes under “SystemServiceAzureSpringAppsResourceProvider”. 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 135.224.49.224/27; allow 135.225.68.128/27; allow 172.173.57.160/27; allow 172.178.153.64/27; allow 172.187.45.192/27; deny all;
iptables (first 5 prefixes)
iptables -A INPUT -s 135.224.49.224/27 -j ACCEPT iptables -A INPUT -s 135.225.68.128/27 -j ACCEPT iptables -A INPUT -s 172.173.57.160/27 -j ACCEPT iptables -A INPUT -s 172.178.153.64/27 -j ACCEPT iptables -A INPUT -s 172.187.45.192/27 -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