Building on this PDF [2] of IRLP nodes, here's an editable google spreadsheet [3].
Links
[1] http://spreadsheets.google.com/pub?key=tSajFhOMMUdNjvzfB93bu5g&output=html
[2] http://www.ciinet.org/nbarc/sites/default/files/VE3ERX%20IRLP%20Guide.pdf
[3] http://spreadsheets.google.com/pub?key=tSajFhOMMUdNjvzfB93bu5g&output=html
[4] http://www.ve3nbc.ca/category/web-links/miscellaneous