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ipv4_is_in_range()

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

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

Syntax

ipv4_is_in_range(Ipv4Address,Ipv4Range)

Learn more about syntax conventions.

Parameters

Name Type Required Description
Ipv4Address string ✔️ An expression representing an IPv4 address.
Ipv4Range string ✔️ An IPv4 range or list of IPv4 ranges written with IP-prefix notation.

IP-prefix notation

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.

Returns

  • 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.

Example

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

ip_address ip_range result
192.168.1.1 192.168.1.1 true
192.168.1.1 192.168.1.255/24 true

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