diff --git a/bin/map_iaids_by_csv.rb b/bin/map_iaids_by_csv.rb
new file mode 100755
index 0000000..50c8543
--- /dev/null
+++ b/bin/map_iaids_by_csv.rb
@@ -0,0 +1,33 @@
+#!/usr/bin/env ruby
+
+require 'csv'
+require 'json'
+require 'fileutils'
+require 'pathname'
+
+input_csv_path = Pathname.new(ARGV[0])
+raise "No file found at #{input_csv_path}" unless input_csv_path.exist?
+
+csv_raw = CSV.read(input_csv_path)
+iaid_index = csv_raw[0].index('iaid')
+iaids = csv_raw.map { |row| row[iaid_index].split('|') }
+iaids.flatten!
+iaids.uniq!
+iaids -= ['iaid', ' '] # remove column header and blank values
+iaids.sort!
+
+puts "Found #{iaids.size} unique IAIDs"
+
+h = {}
+iaids.each { |iaid| h[iaid] = {} }
+
+filename, _ext = input_csv_path.basename.to_s.split('.')
+json_filename = "#{filename}IAIDs.json"
+json_path = Pathname.new("tmp/#{json_filename}")
+FileUtils.mkdir_p(json_path.dirname)
+
+File.open(json_path, 'w') do |file|
+  file.puts JSON.pretty_generate(JSON.parse(h.to_json))
+end
+
+puts "Output: #{json_path}"