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The domain name system DNS
The Domain Name System (DNS) is one of the most important services in the internet. Its main function is to translate between domain names and IP addresses and to list mail exchange servers accepting e-mail for each domain. The DNS is a hierarchical Database that manages the internet namespace, distributed over thousands of servers worldwide. This namespace is devided in zones, of which each is under the responsibility of independent administrators.
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    Uniplace CheckDNS.NET 2.0 (build 117)

CheckDNS.NET is testing google.com


CheckDNS.NET is asking root servers about authoritative NS for domain
  Got DNS list for 'google.com' from a.gtld-servers.net or a.gtld-servers.net or a.gtld-servers.net or a.gtld-servers.net
  Found NS record: ns1.google.com[216.239.32.10], was resolved to IP address by a.gtld-servers.net
  Found NS record: ns2.google.com[216.239.34.10], was resolved to IP address by a.gtld-servers.net
  Found NS record: ns3.google.com[216.239.36.10], was resolved to IP address by a.gtld-servers.net
  Found NS record: ns4.google.com[216.239.38.10], was resolved to IP address by a.gtld-servers.net
  Domain has 4 DNS server(s)

CheckDNS.NET is verifying if NS are alive
  DNS server ns1.google.com[216.239.32.10] is alive and authoritative for domain google.com
  DNS server ns2.google.com[216.239.34.10] is alive and authoritative for domain google.com
  DNS server ns3.google.com[216.239.36.10] is alive and authoritative for domain google.com
  DNS server ns4.google.com[216.239.38.10] is alive and authoritative for domain google.com
  4 server(s) are alive

CheckDNS.NET checks if all NS have the same version
  All 4 your servers have the same zone version 1426666

CheckDNS.NET verifies www servers
  DNS round-robing with multiple web servers detected
  Checking HTTP server www.google.com [209.85.227.105]
  HTTP server www.google.com[209.85.227.105] answers on port 80
  Received: HTTP/1.1 302 Found Location: http://www.google.ch/
  Your main page redirects to another location. Several search engines will be unable to index your site.
  Checking HTTP server www.google.com [209.85.227.99]
  HTTP server www.google.com[209.85.227.99] answers on port 80
  Received: HTTP/1.1 302 Found Location: http://www.google.ch/
  Your main page redirects to another location. Several search engines will be unable to index your site.
  Checking HTTP server www.google.com [209.85.227.147]
  HTTP server www.google.com[209.85.227.147] answers on port 80
  Received: HTTP/1.1 302 Found Location: http://www.google.ch/
  Your main page redirects to another location. Several search engines will be unable to index your site.
  Checking HTTP server www.google.com [209.85.227.104]
  HTTP server www.google.com[209.85.227.104] answers on port 80
  Received: HTTP/1.1 302 Found Location: http://www.google.ch/
  Your main page redirects to another location. Several search engines will be unable to index your site.
  Checking HTTP server www.google.com [209.85.227.106]
  HTTP server www.google.com[209.85.227.106] answers on port 80
  Received: HTTP/1.1 302 Found Location: http://www.google.ch/
  Your main page redirects to another location. Several search engines will be unable to index your site.
  Checking HTTP server www.google.com [209.85.227.103]
  HTTP server www.google.com[209.85.227.103] answers on port 80
  Received: HTTP/1.1 302 Found Location: http://www.google.ch/
  Your main page redirects to another location. Several search engines will be unable to index your site.

CheckDNS.NET tests mail-servers
  Domain google.com has 4 mail-servers.
  Checking mail server (PRI=100) google.com.s9a1.psmtp.com [74.125.148.10]
  Mail server google.com.s9a1.psmtp.com[74.125.148.10] answers on port 25
  <<< 220 Postini ESMTP 233 postini-dev-08/06/10_08:50:22 ready. CA Business and Professions Code Section 17538.45 forbids use of this system for unsolicited electronic mail advertisements.
  >>> HELO www.checkdns.net
  <<< 250 Postini says hello back
  >>> MAIL FROM: <dnscheck@uniplace.com>
  <<< 250 Ok
  >>> RCPT TO: <postmaster@google.com>
  <<< 250 Ok
  >>> QUIT
  Mail server google.com.s9a1.psmtp.com [74.125.148.10] accepts mail for google.com
  Checking mail server (PRI=200) google.com.s9a2.psmtp.com [74.125.148.11]
  Mail server google.com.s9a2.psmtp.com[74.125.148.11] answers on port 25
  <<< 220 Postini ESMTP 185 postini-dev-08/06/10_08:50:22 ready. CA Business and Professions Code Section 17538.45 forbids use of this system for unsolicited electronic mail advertisements.
  >>> HELO www.checkdns.net
  <<< 250 Postini says hello back
  >>> MAIL FROM: <dnscheck@uniplace.com>
  <<< 250 Ok
  >>> RCPT TO: <postmaster@google.com>
  <<< 250 Ok
  >>> QUIT
  Mail server google.com.s9a2.psmtp.com [74.125.148.11] accepts mail for google.com
  Checking mail server (PRI=300) google.com.s9b1.psmtp.com [74.125.148.13]
  Mail server google.com.s9b1.psmtp.com[74.125.148.13] answers on port 25
  <<< 220 Postini ESMTP 251 postini-dev-08/06/10_08:50:22 ready. CA Business and Professions Code Section 17538.45 forbids use of this system for unsolicited electronic mail advertisements.
  >>> HELO www.checkdns.net
  <<< 250 Postini says hello back
  >>> MAIL FROM: <dnscheck@uniplace.com>
  <<< 250 Ok
  >>> RCPT TO: <postmaster@google.com>
  <<< 250 Ok
  >>> QUIT
  Mail server google.com.s9b1.psmtp.com [74.125.148.13] accepts mail for google.com
  Checking mail server (PRI=400) google.com.s9b2.psmtp.com [74.125.148.14]
  Mail server google.com.s9b2.psmtp.com[74.125.148.14] answers on port 25
  <<< 220 Postini ESMTP 173 postini-dev-08/06/10_08:50:22 ready. CA Business and Professions Code Section 17538.45 forbids use of this system for unsolicited electronic mail advertisements.
  >>> HELO www.checkdns.net
  <<< 250 Postini says hello back
  >>> MAIL FROM: <dnscheck@uniplace.com>
  <<< 250 Ok
  >>> RCPT TO: <postmaster@google.com>
  <<< 250 Ok
  >>> QUIT
  Mail server google.com.s9b2.psmtp.com [74.125.148.14] accepts mail for google.com
  All MX are configured properly


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