Software

From SpeechWiki

Phonetic Transcription Tool

This tool gives the American English phonetic transcription of any string. It uses an HMM model to either generate a most likely phonetic transcription, or if a phonetic transcription is provided, it can perform forced alignment. So, it gives a reasonable pronounciation for out-of-dictionary words, or partially pronounced words.

Phonetic Transcription Tool. You can try out the demo here.