Keysight EL30000 Serie Guide D'utilisation page 53

More about IP addresses and dot notation
Dot-notation addresses ("nnn.nnn.nnn.nnn" where "nnn" is a byte value from 0 to 255) must be expressed with
care, as most PC web software interprets byte values with leading zeros as octal (base 8) numbers. For example,
"192.168.020.011" is equivalent to decimal "192.168.16.9" because ".020" is 16 expressed in octal, and ".011"
(octal) is "9" (base 10). To avoid confusion, use only decimal values from 0 to 255, with no leading zeros.
Keysight EL30000 Series User's Guide 53