postmap -q "67.218.188" 
mysql:/usr/local/etc/postfix/mysql-mta_clients_reactive_b.cf
 554 mta_client_reactive_b

postmap -q "67.218.188.4" 
mysql:/usr/local/etc/postfix/mysql-mta_clients_reactive_b.cf
... no data

man 5 access  seems to make no distinction between .map and SQL tables:

HOST NAME/ADDRESS PATTERNS

With lookups from indexed files such as DB or DBM,  or  from  networked
tables  such  as  NIS,  LDAP  or SQL, the following lookup patterns are
examined in the order as listed

Subnetworks  are  matched  by  repeatedly  truncating  the  last
".octet"  from the remote IPv4 host address string until a match
is found in the access table, or until further truncation is not
possible.

Len

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