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azure · AzureFrontDoor.Backend

Microsoft Azure uses 249 prefixes for AzureFrontDoor.Backend.

Last updated 5 Nov 2026 from Microsoft Azure’s own list (file dated 2026-11-02 (change 425))

Short answer

AzureFrontDoor.Backend are the addresses Azure Front Door connects to your origin from.

IPv4 prefixes157
IPv6 prefixes92
Regions in the first 100—
Fetched by peekip5 Nov 2026

Prefixes

PrefixRegion / locationService
102.133.216.88/29—AzureFrontDoor.Backend
102.133.56.88/29—AzureFrontDoor.Backend
13.73.248.16/29—AzureFrontDoor.Backend
135.222.195.0/29—AzureFrontDoor.Backend
135.222.195.8/31—AzureFrontDoor.Backend
145.191.109.48/28—AzureFrontDoor.Backend
147.243.0.0/16—AzureFrontDoor.Backend
157.55.93.2/31—AzureFrontDoor.Backend
158.23.108.56/29—AzureFrontDoor.Backend
172.165.55.172/31—AzureFrontDoor.Backend
172.165.55.240/29—AzureFrontDoor.Backend
172.166.242.232/29—AzureFrontDoor.Backend
172.179.226.0/29—AzureFrontDoor.Backend
172.179.226.8/31—AzureFrontDoor.Backend
172.186.128.148/31—AzureFrontDoor.Backend
172.186.129.160/29—AzureFrontDoor.Backend
172.186.135.168/30—AzureFrontDoor.Backend
172.186.135.55/32—AzureFrontDoor.Backend
172.192.196.120/29—AzureFrontDoor.Backend
172.192.205.94/31—AzureFrontDoor.Backend
172.192.208.104/29—AzureFrontDoor.Backend
172.192.222.178/32—AzureFrontDoor.Backend
172.192.222.180/30—AzureFrontDoor.Backend
172.199.128.49/32—AzureFrontDoor.Backend
172.199.23.76/30—AzureFrontDoor.Backend
172.199.23.80/29—AzureFrontDoor.Backend
172.199.232.0/29—AzureFrontDoor.Backend
172.199.232.8/31—AzureFrontDoor.Backend
172.204.165.112/29—AzureFrontDoor.Backend
172.207.68.70/31—AzureFrontDoor.Backend
172.207.69.80/30—AzureFrontDoor.Backend
191.233.9.120/29—AzureFrontDoor.Backend
191.235.225.128/29—AzureFrontDoor.Backend
20.113.254.88/29—AzureFrontDoor.Backend
20.115.247.64/29—AzureFrontDoor.Backend
20.118.195.128/29—AzureFrontDoor.Backend
20.119.155.128/29—AzureFrontDoor.Backend
20.15.221.168/29—AzureFrontDoor.Backend
20.150.160.96/29—AzureFrontDoor.Backend
20.165.78.75/32—AzureFrontDoor.Backend
20.17.126.64/29—AzureFrontDoor.Backend
20.189.106.112/29—AzureFrontDoor.Backend
20.192.161.104/29—AzureFrontDoor.Backend
20.192.225.48/29—AzureFrontDoor.Backend
20.197.145.10/31—AzureFrontDoor.Backend
20.197.145.16/29—AzureFrontDoor.Backend
20.21.37.40/29—AzureFrontDoor.Backend
20.210.70.64/30—AzureFrontDoor.Backend
20.215.4.240/29—AzureFrontDoor.Backend
20.217.44.240/29—AzureFrontDoor.Backend
Showing 50 of 249 prefixes All prefixes (CSV)

What changed

  • 7 Oct 2026
    + 74.152.14.160/29

Allowlist formats

nginx (first 5 prefixes)
allow 102.133.216.88/29;
allow 102.133.56.88/29;
allow 13.73.248.16/29;
allow 135.222.195.0/29;
allow 135.222.195.8/31;
deny all;
iptables (first 5 prefixes)
iptables -A INPUT -s 102.133.216.88/29 -j ACCEPT
iptables -A INPUT -s 102.133.56.88/29 -j ACCEPT
iptables -A INPUT -s 13.73.248.16/29 -j ACCEPT
iptables -A INPUT -s 135.222.195.0/29 -j ACCEPT
iptables -A INPUT -s 135.222.195.8/31 -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 5 Nov 2026
  2. Microsoft Azure documentation