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azure · CognitiveServicesFrontend

Microsoft Azure uses 150 prefixes for CognitiveServicesFrontend.

Last updated 3 Nov 2026 from Microsoft Azure’s own list (file dated 2026-10-26 (change 424))

Short answer

Microsoft Azure lists these prefixes under “CognitiveServicesFrontend”. 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.

IPv4 prefixes76
IPv6 prefixes74
Regions in the first 100—
Fetched by peekip3 Nov 2026

Prefixes

PrefixRegion / locationService
102.37.85.240/28—CognitiveServicesFrontend
134.138.83.96/28—CognitiveServicesFrontend
158.23.112.144/28—CognitiveServicesFrontend
172.129.95.240/28—CognitiveServicesFrontend
172.194.84.80/28—CognitiveServicesFrontend
172.198.99.16/28—CognitiveServicesFrontend
172.204.167.96/28—CognitiveServicesFrontend
191.238.78.0/28—CognitiveServicesFrontend
20.100.2.16/28—CognitiveServicesFrontend
20.105.208.224/28—CognitiveServicesFrontend
20.111.0.224/28—CognitiveServicesFrontend
20.111.78.32/28—CognitiveServicesFrontend
20.150.130.224/28—CognitiveServicesFrontend
20.167.131.96/28—CognitiveServicesFrontend
20.17.127.80/28—CognitiveServicesFrontend
20.17.59.112/28—CognitiveServicesFrontend
20.189.194.80/28—CognitiveServicesFrontend
20.192.153.128/28—CognitiveServicesFrontend
20.195.85.144/28—CognitiveServicesFrontend
20.200.196.80/28—CognitiveServicesFrontend
20.204.192.16/28—CognitiveServicesFrontend
20.205.69.48/28—CognitiveServicesFrontend
20.207.1.48/28—CognitiveServicesFrontend
20.208.5.16/28—CognitiveServicesFrontend
20.213.227.224/28—CognitiveServicesFrontend
20.215.13.32/28—CognitiveServicesFrontend
20.217.53.32/28—CognitiveServicesFrontend
20.45.242.160/28—CognitiveServicesFrontend
20.45.94.112/28—CognitiveServicesFrontend
20.47.233.144/28—CognitiveServicesFrontend
20.48.202.128/28—CognitiveServicesFrontend
20.51.6.0/28—CognitiveServicesFrontend
20.52.95.32/28—CognitiveServicesFrontend
20.58.71.240/28—CognitiveServicesFrontend
20.59.79.224/28—CognitiveServicesFrontend
20.69.5.144/28—CognitiveServicesFrontend
20.70.222.80/28—CognitiveServicesFrontend
20.83.222.64/28—CognitiveServicesFrontend
20.87.80.48/28—CognitiveServicesFrontend
20.88.157.144/28—CognitiveServicesFrontend
20.89.12.160/28—CognitiveServicesFrontend
20.90.132.112/28—CognitiveServicesFrontend
20.92.4.176/28—CognitiveServicesFrontend
20.97.34.240/28—CognitiveServicesFrontend
20.98.146.48/28—CognitiveServicesFrontend
20.98.193.240/28—CognitiveServicesFrontend
23.101.195.26/32—CognitiveServicesFrontend
4.171.26.80/28—CognitiveServicesFrontend
4.187.64.96/28—CognitiveServicesFrontend
4.232.40.128/28—CognitiveServicesFrontend
Showing 50 of 150 prefixes All prefixes (CSV)

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 102.37.85.240/28;
allow 134.138.83.96/28;
allow 158.23.112.144/28;
allow 172.129.95.240/28;
allow 172.194.84.80/28;
deny all;
iptables (first 5 prefixes)
iptables -A INPUT -s 102.37.85.240/28 -j ACCEPT
iptables -A INPUT -s 134.138.83.96/28 -j ACCEPT
iptables -A INPUT -s 158.23.112.144/28 -j ACCEPT
iptables -A INPUT -s 172.129.95.240/28 -j ACCEPT
iptables -A INPUT -s 172.194.84.80/28 -j ACCEPT

Generate the full list from the CSV, and refresh it on a schedule: providers add and retire prefixes often.

Sources

  1. Microsoft Azure: published IP ranges · checked 3 Nov 2026
  2. Microsoft Azure documentation