postgresql-8.4-prefix 1.1.0-1.1 (ia64 binary) in ubuntu lucid

 This PostgreSQL module provides the prefix_range datatype, which
 allows to index searches such as finding the longest prefix matching
 a telephone number, having prefixes in a table and telephone number
 as a parameter:
 .
  select * from prefixes where prefix @> '0100091234';
 .
 The prefix column has to be of type prefix_range, and any text field
 can get indexed by the provided GiST opclass.