DNS
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DNS Servers Open to Public Query
| IP Address | Provider | Location |
|---|---|---|
| 8.8.8.8 | ||
| 8.8.4.4 | ||
| 156.154.70.1 | DNSadvantage | |
| 156.154.71.1 | DNSadvantage | |
| 208.67.220.220 | OpenDNS | Global, mainly US (routed via Anycast) |
| 208.67.220.222 | OpenDNS | Global, mainly US (routed via Anycast) |
| 4.2.2.1 | Verizon | |
| 4.2.2.2 | Verizon | |
| 194.72.9.34 | BT | UK |
| 194.72.9.34 | BT | UK |
Sources: http://theos.in/windows-xp/free-fast-public-dns-server-list/
NSLookup
NSLookup is a Name Server Lookup/Query tool which exists in both Unix and Windows distributions, and generally speaking, functionaly the same regardless of which version you're using. To start, run nslookup from the command line.
| Command | Description |
|---|---|
server |
Displays the DNS server(s) currently being used by nslookup |
server 8.8.4.4 |
Changes the DNS server being used/queried to 8.8.4.4 |
host.domain.com |
Attempts to resolve host.domain.com against current DNS server
|
109.123.76.85 |
Attempts a reverse lookup for IP 109.123.76.85 against current DNS server
|
set q=mx |
Set query type to MX (subsequent queries will look for Message Exchange (email) records)
|
set q=all |
Set query type back to all records |
exit |
Quit nslookup |
For example, to find the email exchange servers for a particular domain...
> set q=mx > microsoft.com Server: [8.8.4.4] Address: 8.8.4.4 Non-authoritative answer: microsoft.com MX preference = 10, mail exchanger = mail.messaging.microsoft.com >