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If you wish to use Wake On Lan over the internet you will need to set up your destination firewall/router to allow "Subnet Directed Broadcasts". Most routers and firewalls disable this option by default.

You will then need to allow traffic through on your firewall/router on a specific port. The choice of ports is up to you.

Subnet directed broadcasts

A principal limitation of standard broadcast wake-on-LAN is that broadcast packets are generally not routed. This prevents the technique being used in larger networks or over the Internet. Subnet directed broadcasts (SDB)[9][10] may be used to overcome this limitation. SDB may require changes to intermediate router configuration. Subnet directed broadcasts are treated like unicast network packets until processed by the final (local) router. This router then broadcasts the packet using layer 2 broadcast. This technique allows a broadcast to be initiated on a remote network but requires all intervening routers to forward the SDB.[11][12] When preparing a network to forward SDB packets, care must be taken to filter packets so that only desired (e.g. WoL) SDB packets are permitted — otherwise the network may become a participant in DDoS attacks such as the Smurf Attack.