registrar.io
most of the major tlds are taken.
godaddy appraises it at $4668
here are some sales results from the keyword registrar via namebio:
registrardaily.com 240 USD 2020-01-11
GoDaddy
businessregistrar.com 810 USD 2017-06-20
GoDaddy
domainnameregistrar.com 108 USD 2016-06-11 NameJet
domainregistrar.co 225 USD 2015-04-14 Flippa
allregistrars.com 283 USD 2014-10-20
GoDaddy
kentuckyregistrar.net 160 USD 2014-01-14
GoDaddy
registrare.com 511 USD 2013-08-13 NameJet
myregistrar.com 1,100 USD 2012-11-11 Afternic
domainregistrars.net 300 USD 2009-11-17 SnapNames
domainregistrars.com 3,530 USD 2007-11-13 Private
estibot appraisal: $560
it is a single word .io and .io's are hot rite now
reseller: low to mid $xxx
enduser: mid $xxxx
great find.