ipv4_is_in_range()

Applies to: ✅ Azure Data Explorer ✅ Azure Monitor ✅ Microsoft Sentinel

Checks if IPv4 string address is in IPv4-prefix notation range.

ipv4_is_in_range(Ipv4Address,Ipv4Range)

Learn more about syntax conventions.

IP-prefix notation (also known as CIDR notation) is a concise way of representing an IP address and its associated network mask. The format is <base IP>/<prefix length>, where the prefix length is the number of leading 1 bits in the netmask. The prefix length determines the range of IP addresses that belong to the network.

For IPv4, the prefix length is a number between 0 and 32. So the notation 192.168.2.0/24 represents the IP address 192.168.2.0 with a netmask of 255.255.255.0. This netmask has 24 leading 1 bits, or a prefix length of 24.

For IPv6, the prefix length is a number between 0 and 128. So the notation fe80::85d:e82c:9446:7994/120 represents the IP address fe80::85d:e82c:9446:7994 with a netmask of ffff:ffff:ffff:ffff:ffff:ffff:ffff:ff00. This netmask has 120 leading 1 bits, or a prefix length of 120.

• true: If the long representation of the first IPv4 string argument is in range of the second IPv4 string argument.
• false: Otherwise.
• null: If conversion for one of the two IPv4 strings wasn't successful.

datatable(ip_address:string, ip_range:string)
[
 '192.168.1.1',    '192.168.1.1',       // Equal IPs
 '192.168.1.1',    '192.168.1.255/24',  // 24 bit IP-prefix is used for comparison
]
| extend result = ipv4_is_in_range(ip_address, ip_range)

Output

• Overview of IPv4/IPv6 functions
• Overview of IPv4 text match functions