According to http://dev.mysql.com/doc/refman/5.7/en/account-names.html:
"Because you can use IP wildcard values in host values (for example,
'192.168.1.%' to match every host on a subnet), someone could try to
exploit this capability by naming a host 192.168.1.somewhere.com. To
foil such attempts, MySQL disallows matching on host names that start
with digits and a dot. Thus, if you have a host named something like
1.2.example.com, its name never matches the host part of account names.
An IP wildcard value can match only IP addresses, not host names." this
is not a bug. Closed as "Invalid"
** Changed in: percona-server/5.5
Status: Triaged => Invalid
** Changed in: percona-server/5.6
Status: Triaged => Invalid
** Changed in: percona-server/5.7
Status: Triaged => Invalid
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https://bugs.launchpad.net/bugs/1571922
Title:
MySQL doesn't allow access to host names that are just numeric
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