I do not think there is. Why would you need to ban them via MAC address? And IP ban would prove more efficient, and it would keep the player from getting banned and logging on from another computer.
IP Brasileiro é IP Dinamico desliga o ADSL e liga novamente , o ip muda ---- in role-playing game called Aion is a plugin that works banning mac-adress, systemservers in AION use JAVA BrazilianIPisDynamic IP:( ADSLdisconnectsand connectsagain, theipchanges
you know w/ some ISP's the Users MAC-ADDRESS never leaves the Modem aka its just not transmitted, besides ban by user, = they need a new account but ban by ip, they just use either an MAC-Address spoofer reset net device, Pfft! new IP, and for ISP's where the Mac Adress IS indeed transmitted past thier modem, yet again Direct connect to modem and Spoof mac address, i use dto spoof for new IP to bypass download X ammount of times an hour. and most griefer teams will do this when they have multiple accounts. (i've seen in afew of team avo's redit server video's they've done Just that to get around IP Bans) for the everyday small time griefer, a Username ban is good enough as they'll stop at that and likely cant afford or wont buy a new MC Account.