https://bugzilla.mindrot.org/show_bug.cgi?id=2626

            Bug ID: 2626
           Summary: ssh 172.10 resolves to ssh 172.0.0.10
           Product: Portable OpenSSH
           Version: 7.3p1
          Hardware: 68k
                OS: Mac OS X
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Miscellaneous
          Assignee: unassigned-b...@mindrot.org
          Reporter: rajk...@yahoo.com

Hello Team,

I found something weird today, i tried to ssh into a box with the below
command, instead of throwing an error it filled the middle to octet
with zeros. 

Looks like ssh is greed and tries to left-pad everything with zero
until it gets 4 octets. See the below two examples

1.
hostname $/usr/local/bin/ssh -v 172.10
OpenSSH_7.3p1, OpenSSL 1.0.2j  26 Sep 2016
debug1: Reading configuration data /Users/name/.ssh/config
debug1: /Users/name/.ssh/config line 2: Applying options for *
debug1: Reading configuration data /usr/local/etc/ssh/ssh_config
debug1: Connecting to 172.10 [172.0.0.10] port 22.
^C
hostname $


2.
hostname $ssh -v 172
OpenSSH_6.9p1, LibreSSL 2.1.8
debug1: Reading configuration data /Users/name/.ssh/config
debug1: /Users/name/.ssh/config line 2: Applying options for *
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 21: Applying options for *
debug1: Connecting to 172 [0.0.0.172] port 22.
debug1: connect to address 0.0.0.172 port 22: No route to host
ssh: connect to host 172 port 22: No route to host

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