SE Ranking - All-in-One cloud-based SEO software for agencies, marketing teams and webmasters
DNSChecker.org - Check DNS Propagation worldwide. DNS Checker provides name server propagation check instantly. Changed nameservers so do a DNS lookup and check if DNS and nameservers have propagated.
DeskAlerts - Send alerts to any corporate device: PCs, phones, tablets, etc.
Whats My DNS - Instantly check your domain names current IP address and DNS record information against multiple name servers located in different parts of the world.
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
NsLookup.io - A simple and powerful tool for querying DNS records