Microsoft Azure uses 24 prefixes for AzureLoadTestingInstanceManagement.
Short answer
Microsoft Azure lists these prefixes under “AzureLoadTestingInstanceManagement”. 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 20.107.239.218/32; allow 20.117.192.200/32; allow 20.125.7.20/30; allow 20.14.122.64/32; allow 20.18.2.123/32; deny all;
iptables (first 5 prefixes)
iptables -A INPUT -s 20.107.239.218/32 -j ACCEPT iptables -A INPUT -s 20.117.192.200/32 -j ACCEPT iptables -A INPUT -s 20.125.7.20/30 -j ACCEPT iptables -A INPUT -s 20.14.122.64/32 -j ACCEPT iptables -A INPUT -s 20.18.2.123/32 -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 4 Nov 2026
- Microsoft Azure documentation