Online Tools

AS-Report: Shows all about uplinks, downlinks, subnets, IP addresses, and whois-inof.

IP Locator: Convert and locate IP addresses

DNS Lookup: Check your DNS MX Records online

Microsoft Exchange Remote Connectivity Analyzer can do these tests:

Microsoft Exchange ActiveSync Connectivity Tests
Microsoft Exchange Web Services Connectivity Tests
Microsoft Office Outlook Connectivity Tests
Internet E-Mail Tests

Multi DNS Block checker: look up an IP address in DNS blackhole lists

My IP Address: check your computer public IP address.

Nameserver-Report for Domain: check NS/MX-Records and all relevant infos about a domains nameserver-configuration

SSL Checker: Shows information about the SSL-Certificate of a SSL-enabled server, checks the servers preferred SSL-handshake, the preferred cipher and cipherstrength and show then all supported ciphers. This service is primary targeted to HTTPS, but you can also check other SSL-enabled servers like POP3S (port:995) SSMTP (port:465) or even SSH.
Please be patient - a complete SSL-Check can take up to 2 minutes depending on the serverload and speed.

Who is:

WHOIS Search for Domain Registration Information | Network Solutions

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