Microsoft 365 IP ranges

Current IP ranges (CIDRs) used by the Microsoft 365 cloud infrastructure, updated daily.

curl -O https://cloud-ip-ranges.com/download/microsoft-365.txt

Blocking Microsoft 365

iptables

curl -sO https://cloud-ip-ranges.com/download/microsoft-365.txt
while read ip; do
  iptables -A INPUT -s $ip -j DROP
  iptables -A OUTPUT -d $ip -j DROP
done < microsoft-365.txt

ufw

curl -sO https://cloud-ip-ranges.com/download/microsoft-365.txt
while read ip; do
  ufw deny from $ip
  ufw deny to $ip
done < microsoft-365.txt

fail2ban

sudo tee /etc/fail2ban/filter.d/microsoft-365-block.conf << EOF
[Definition]
failregex = ^.*$
ignoreregex =
EOF

sudo tee /etc/fail2ban/jail.d/microsoft-365-block.conf << EOF
[microsoft-365-block]
enabled = true
filter = microsoft-365-block
action = iptables-allports[name=microsoft-365]
logpath = /tmp/microsoft-365.txt
findtime = 1
bantime = -1
maxretry = 1
EOF

curl -so /tmp/microsoft-365.txt https://cloud-ip-ranges.com/download/microsoft-365.txt
sudo systemctl restart fail2ban

pfSense / OPNsense

curl -sO https://cloud-ip-ranges.com/download/microsoft-365.txt
# Firewall > Aliases: new alias MICROSOFT-365_BLOCK, type Network(s), import the file
# Firewall > Rules > WAN: Action=Block, Source=MICROSOFT-365_BLOCK

About

These IP ranges are sourced directly from Microsoft 365's official feeds and are updated regularly to ensure accuracy. The data includes IPv4 and IPv6 ranges used by Microsoft 365's infrastructure worldwide. Last update was about 3 hours ago.

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