Dlink:
For the DI-5xx, DI-6xx, DI-704P (revC), DI-704UP, DI-754, DI-764, DI-774, DI-784, DI-804HV, DI-808HV, and DI-824VUP, DI-704P (rev.B) and DI-707P, DI-704, DI-704P (revA), DI-707, DI-711 (revA), DI-713, and DI-713P:
http://support.dlink.com/faq/view.asp?prod_id=1337

Linksys:
Linksys Knowledge Base Search for Open Ports

These are the 2 routers Ive used