Hex edit in vim

When I edit the binary file in hex mode in vim. I would like to have the ascii view updated once I change the hex value. Is it possible to do so? 

Current behavior is :

0000000: 3132 372e 302e 302e 3109 0920 2020 206c  127.0.0.1..    l

0000010: 6f63 616c 686f 7374 0a                   ocalhost.

Change the first byte. But the ASCII view does not changed accordingly.

0000000: 3232 372e 302e 302e 3109 0920 2020 206c  127.0.0.1..    l

0000010: 6f63 616c 686f 7374 0a                   ocalhost.

I would like to vim act like this

0000000: 3232 372e 302e 302e 3109 0920 2020 206c  227.0.0.1..    l

0000010: 6f63 616c 686f 7374 0a                   ocalhost.

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