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If you already have map tags in your page and wish to edit it for proper coordinates without creating trouble for yourself, there is a Firefox add-on available called the Image Map Editor (https://addons.mozilla.org/en-us/firefox/addon/ime/).

If you want to know the IP address of your name servers, use the $ grepnameserver /etc/resolv.conf command in Linux and C:/>ipconfig /all in Windows. Even you can get the website's details from your name server, that is, host website-name <nameserver>. There is a Firefox add-on that will speed up DNS resolution by doing pre-DNS work and you will observe faster loading of the website. Download Speed DNS from https://addons.mozilla.org/en-US/firefox/addon/speed-dns/?src=search.