We are having multiple servers setup for the service activation. Free service or any service will be hosted on the assigned server after validation. So every server is having its unique nameserver and which we are supposed to send through welcome email after service activation. Kindly allow sometime for the welcome email to reach under mailbox or spambox of your registered email id.
You can then update those nameservers at your registrar end or we will set them on your behalf in case you are having registration service with HostPoco.