There's also 10bit addressing mode. I couldn't find a reference to address fees on NXP's current website, but as recently as 2013 they had a FAQ on their websit

There's also 10bit addressing mode. I couldn't find a reference to address fees on NXP's current website, but as recently as 2013 they had a FAQ on their website mentioning address allocation fees: https://web.archive.org/web/20130401000000*/http://www.nxp.com/products/interface_control/i2c/faq/ https://web.archive.org/web/20130401000000*/http://www.nxp.c...