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azure · MicrosoftAzureFluidRelay

Microsoft Azure uses 78 prefixes for MicrosoftAzureFluidRelay.

Last updated 4 Nov 2026 from Microsoft Azure’s own list (file dated 2026-11-02 (change 425))

Short answer

Microsoft Azure lists these prefixes under “MicrosoftAzureFluidRelay”. 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 prefixes37
IPv6 prefixes41
Regions in the first 100—
Fetched by peekip4 Nov 2026

Prefixes

PrefixRegion / locationService
102.37.163.56/29—MicrosoftAzureFluidRelay
102.37.81.232/29—MicrosoftAzureFluidRelay
168.61.232.4/30—MicrosoftAzureFluidRelay
191.238.73.104/29—MicrosoftAzureFluidRelay
20.150.129.128/28—MicrosoftAzureFluidRelay
20.192.47.144/29—MicrosoftAzureFluidRelay
20.193.199.128/29—MicrosoftAzureFluidRelay
20.195.150.136/29—MicrosoftAzureFluidRelay
20.195.69.176/29—MicrosoftAzureFluidRelay
20.195.78.224/29—MicrosoftAzureFluidRelay
20.200.192.40/29—MicrosoftAzureFluidRelay
20.215.111.24/29—MicrosoftAzureFluidRelay
20.252.209.12/30—MicrosoftAzureFluidRelay
20.40.231.80/29—MicrosoftAzureFluidRelay
20.48.199.8/29—MicrosoftAzureFluidRelay
20.51.1.80/29—MicrosoftAzureFluidRelay
20.51.14.80/28—MicrosoftAzureFluidRelay
20.52.93.32/29—MicrosoftAzureFluidRelay
20.59.76.224/28—MicrosoftAzureFluidRelay
20.62.63.224/28—MicrosoftAzureFluidRelay
20.65.135.48/28—MicrosoftAzureFluidRelay
20.70.220.8/29—MicrosoftAzureFluidRelay
20.82.244.56/29—MicrosoftAzureFluidRelay
20.82.246.32/28—MicrosoftAzureFluidRelay
20.86.92.224/28—MicrosoftAzureFluidRelay
20.88.152.224/28—MicrosoftAzureFluidRelay
20.88.152.240/29—MicrosoftAzureFluidRelay
20.89.9.24/29—MicrosoftAzureFluidRelay
20.92.0.48/29—MicrosoftAzureFluidRelay
4.171.26.64/29—MicrosoftAzureFluidRelay
40.120.85.224/29—MicrosoftAzureFluidRelay
51.107.243.232/29—MicrosoftAzureFluidRelay
51.12.29.16/29—MicrosoftAzureFluidRelay
51.120.237.48/29—MicrosoftAzureFluidRelay
51.138.215.0/29—MicrosoftAzureFluidRelay
51.143.214.104/29—MicrosoftAzureFluidRelay
72.146.91.192/29—MicrosoftAzureFluidRelay
2603:1000:104:3::1f0/125—MicrosoftAzureFluidRelay
2603:1000:4:1::4b8/125—MicrosoftAzureFluidRelay
2603:1010:101:2::330/125—MicrosoftAzureFluidRelay
2603:1010:6:2::730/125—MicrosoftAzureFluidRelay
2603:1020:1004:3::780/125—MicrosoftAzureFluidRelay
2603:1020:1204:2::648/125—MicrosoftAzureFluidRelay
2603:1020:1302:3::100/125—MicrosoftAzureFluidRelay
2603:1020:1302:4::1c8/125—MicrosoftAzureFluidRelay
2603:1020:1403:3::4c0/125—MicrosoftAzureFluidRelay
2603:1020:206:b::e0/124—MicrosoftAzureFluidRelay
2603:1020:5:4::718/125—MicrosoftAzureFluidRelay
2603:1020:5:4::730/124—MicrosoftAzureFluidRelay
2603:1020:705:3::238/125—MicrosoftAzureFluidRelay
Showing 50 of 78 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 102.37.163.56/29;
allow 102.37.81.232/29;
allow 168.61.232.4/30;
allow 191.238.73.104/29;
allow 20.150.129.128/28;
deny all;
iptables (first 5 prefixes)
iptables -A INPUT -s 102.37.163.56/29 -j ACCEPT
iptables -A INPUT -s 102.37.81.232/29 -j ACCEPT
iptables -A INPUT -s 168.61.232.4/30 -j ACCEPT
iptables -A INPUT -s 191.238.73.104/29 -j ACCEPT
iptables -A INPUT -s 20.150.129.128/28 -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 4 Nov 2026
  2. Microsoft Azure documentation