Huawei Option 43 Online Calculator#

In WLAN deployment, APs typically obtain the WAC’s IP address through the DHCP Option 43 field. This tool can be used to quickly calculate the Option 43 Hex configuration string.

WAC IP Address 1:

WAC IP Address 2 (Optional, active/standby scenario):

Calculation Result:

Calculation Instructions#

The format of Huawei Option 43 field is usually: 03 (sub-option type) + Length (hexadecimal, 1 byte) + ASCII Hexadecimal of comma-separated IP string.

Single IP Example: Input 192.168.1.1 (length 11 bytes, hexadecimal is 0B) Output: 030B3139322E3136382E312E31
Dual IP Example: Input 192.168.1.1 and 192.168.1.2, concatenated as 192.168.1.1,192.168.1.2 (length 23 bytes, hexadecimal is 17) Output: 03173139322E3136382E312E312C3139322E3136382E312E32 (Note: According to the standard, when configuring two IP addresses, the calculation length should be the total length of the two IPs and the comma, which is 17.)