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m365 · Microsoft Teams

Microsoft 365 uses 9 prefixes for Microsoft Teams.

Last updated 5 Nov 2026 from Microsoft 365’s own list (file dated version 2026103000)

Short answer

Microsoft Teams (listed under its historical Skype for Business service area): media and signalling.

IPv4 prefixes2
IPv6 prefixes7
Regions in the first 100—
Fetched by peekip5 Nov 2026

Prefixes

PrefixRegion / locationService
52.112.0.0/14—Microsoft Teams
52.122.0.0/15—Microsoft Teams
2603:1027::/48—Microsoft Teams
2603:1037::/48—Microsoft Teams
2603:1047::/48—Microsoft Teams
2603:1057::/48—Microsoft Teams
2603:1063::/38—Microsoft Teams
2620:1ec:40::/42—Microsoft Teams
2620:1ec:6::/48—Microsoft Teams
Showing 9 of 9 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 52.112.0.0/14;
allow 52.122.0.0/15;
allow 2603:1027::/48;
allow 2603:1037::/48;
allow 2603:1047::/48;
deny all;
iptables (first 5 prefixes)
iptables -A INPUT -s 52.112.0.0/14 -j ACCEPT
iptables -A INPUT -s 52.122.0.0/15 -j ACCEPT
ip6tables -A INPUT -s 2603:1027::/48 -j ACCEPT
ip6tables -A INPUT -s 2603:1037::/48 -j ACCEPT
ip6tables -A INPUT -s 2603:1047::/48 -j ACCEPT

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

Sources

  1. Microsoft 365: published IP ranges · checked 5 Nov 2026
  2. Microsoft 365 documentation