The man was sentenced to nine months home detention in early 2018 after pleading guilty to possessing child pornography in early 2016.
At his 2018 sentencing, the Judge also made an order that he be placed on the Child Sex Offender Register, which was established using the Registration Act in late 2016.
The man committed the offence prior to the Registration Act coming into force but was convicted and sentenced after that date.
The man did not seek to appeal his nine-month home detention sentence but challenged the order to be placed on the Register.