Wireshark: Internet Control Message Protocol

Question

I've installed Wireshark on my Windows machine, and to my knowledge, the section at the bottom represents the packets in their octal and ASCII form. When I click on the IP version & the header length (20B), Wireshark highlights 45, which is 69 in decimal and E in ASCII. Could someone please explain this? Thank you.

Answer 1

Both IP version and header length are four-bit headers, located within the same octet.

Indicating insignificant digits with ., hexadecimal 4. or binary 0100.... indicates IPv4, and hex .5 or bin ....0101indicates five 32-bit words or twenty octets.