Domain: ScannerDNS.tk

ScannerDns.tk sounds legit!

Name servers:

scannerdns.tk.          86377   IN      NS      ns1.scannerdns.tk.
scannerdns.tk.          86377   IN      NS      ns2.scannerdns.tk.

;; ADDITIONAL SECTION:
ns2.scannerdns.tk.      86377   IN      A       174.140.167.98
ns1.scannerdns.tk.      86377   IN      A       174.140.167.98

Name server hosted at:  United States Portland Directspace Networks Llc.

Source: http://whois.domaintools.com/174.140.167.98

Scan source:

80.82.70.167 - Ecatel (obviously)

I have seen this IP also request d.directedat.asia.

See http://dnsamplificationattacks.blogspot.nl/2013/05/domain-directedatasia.html