p := PrefixFrom(tt.ip, tt.in)
		if got := p.Bits(); got != tt.want {
			t.Errorf("for (%v, %v), Bits out = %v; want %v", tt.ip, tt.in, got, tt.want)
		}
	}
}

func TestParsePrefixAllocs(t *testing.T) {
	tests := []struct {
		ip    string
		slash string
	}{
		{"192.168.1.0", "/24"},
		{"aaaa:bbbb:cccc::", "/24"},
	}
	for _, test := range tests {