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A More Complex MPF
By modifying the simple MPF above, complexity can be improved. Given the authenticating user and the authenticating system, an MPF with the following components can be constructed:
The more complex MPF contains three elements: 
represents the
first letter of the username, 
represents the first letter of
the hostname or first number of the first address octet,
and
represents the first letters of the
remaining domain name parts or first numbers of the
remaining address octets, concatenated together. This MPF also
contains another special character in addition to the exclamation
mark, the period between the second and third element.
The above MPF would yield such passwords as:
- "d!n.jng" for user druid at system neo.jpl.nasa.gov
- "i!i.n" for user intropy at system intropy.net
- "t!n.o" for user thegnome at system nmrc.org
- "d!1.003" for user druid at system 10.0.0.33
The modified MPF contains two special characters which yields more complex passwords, however, the passwords are still variable length and may not comply with the authenticating system's password length policies. The example MPF is also increasing in complexity and may not be easily remembered.