Subdomain Result Parse Error

[cihanmehmet]

It brings results other than the searched domain. The second is,Results are not uniqe. I'm using the anew command.

# assetfinder --subs-only testfire.net                        
demo.testfire.net
www.testfire.net
testfire.net
evil.testfire.net
domain2.testfire.net
demo2.testfire.net
httpdemo.testfire.net
wellpoint.se srchttpdemo.testfire.net
hkcastte.com srchttpdemo.testfire.net
superkeychain.com srchttpdemo.testfire.net
computerserviceandsales.cn srchttpdemo.testfire.net
wellpoint.jobs.net srchttpdemo.testfire.net
altoro.testfire.net
ftp.testfire.net
localhost.testfire.net

I use it this way.

assetfinder --subs-only testfire.net|xurls -r|anew|grep "testfire.net"|tee testfire.net.txt

assetfinder --subs-only $1|xurls -r|anew|grep "$1"|tee $1.txt