RFC 3177 suggested /48 for customer networks but RFC 6177 allows shorter delegations. /56 and /60 are common allocations for ISPs. /60 should be plenty for resi

RFC 3177 suggested /48 for customer networks but RFC 6177 allows shorter delegations. /56 and /60 are common allocations for ISPs. /60 should be plenty for residential customer especially if larger allocations are available for business customers.