phranque - 11:21 pm on Oct 1, 2013 (gmt 0)
Is this possible to do in DNS management in the CNAME field. ?
Do you get enough requests for the (nonexistent) m. subdomain that you want to capture and redirect them, rather than simply let the DNS send out a "can't find it" error messsage?
there is no way for a webmaster to know what DNS requests are being made for various subdomains.