Category: Internet Networking

DNS Root Servers
article #1017, updated 153 days ago

As of this writing, the current authoritative list, from here:

is: 2001:503:ba3e::2:30 VeriSign, Inc. 2001:500:84::b University of Southern California (ISI) 2001:500:2::c Cogent Communications 2001:500:2d::d University of Maryland 2001:500:a8::e NASA (Ames Research Center) 2001:500:2f::f Internet Systems Consortium, Inc. 2001:500:12::d0d US Department of Defense (NIC) 2001:500:1::53 US Army (Research Lab) 2001:7fe::53 Netnod 2001:503:c27::2:30 VeriSign, Inc. 2001:7fd::1 RIPE NCC 2001:500:9f::42 ICANN 2001:dc3::35 WIDE Project

Categories:   DNS   Internet Networking


Time synchronization (NTP, SNTP) setup
article #37, updated 187 days ago

In Windows Server 2012 R1/2, 2008 R1/2, 7, Vista, and 2003 SP2 and later, it’s good to run the following two commands in an administrative command prompt (an ordinary command prompt for 2003):

w32tm /config /,,, /syncfromflags:MANUAL /reliable:YES /update
w32tm /resync

In Server 2003 SP1 and before, and XP, we use this, because /reliable doesn’t exist:

w32tm /config /,,, /syncfromflags:MANUAL /update
w32tm /resync

Sometimes w32tm doesn’t exist as a service, and has to be registered:

w32tm /register

Under Windows 2000, we need to go a bit more archaic:

net time /
net time /querysntp

If you are using Windows DHCP services, the above is best for the server, but for all of the workstations under its control, place the server’s IP in the Time Server option. This is probably best for a domain. When you have standalone or mobile-capable machines, best to just use the w32tm configuration above.

Categories:   Internet Networking   LAN Networking


DNS, Whois, et cetera
article #12, updated 377 days ago

A great place for general DNS lookup info:

One for WHOIS (use the little submit box in the far upper-right corner):

And one for info about IP addresses:

Categories:   DNS   Internet Networking


Fairer distribution of site Internet bandwidth, via Watchguard
article #945, updated 435 days ago

What will help is a “Per IP Address” type traffic management policy, in Setup / Actions / Traffic Management in WSM, using zero for maximum, 256 for “Maximum instance” (this is the number of IP addresses according to the documentation), and most significantly a low “guaranteed bandwidth” calculated by a formula at or close to this:

(TotalInternetBandwidth รท TotalDHCPLeases) X 0.8

The static multiplier from 0.8 to 0.5 or even less depending on situation, but done properly it will keep everyone working.

Categories:   Internet Networking   


Internet connection speed tests
article #182, updated 497 days ago

Here’s a great new one, HTML5 only, no Flash or Java:

Here’s a commonly used one which requires Flash:

And another which uses java:

Categories:   Internet Networking   LAN Networking


IP4 subnet calculators
article #79, updated 634 days ago

For CIDR to IP range (IP range extraction):

For IP range to CIDR:

For lots and lots more:

Categories:   Internet Networking   LAN Networking


wget for Windows
article #63, updated 939 days ago

Wget is an excellent command-line tool for retrieval of data from http or ftp servers. Its current most-up-to-date Windows version seems to be here:

Categories:   Internet Networking   Tools


Override domain transfer lock on GoDaddy / Wild West Domains
article #647, updated 1237 days ago

After changes are made to domain contacts at GoDaddy, Wild West Domains, and subsidiaries, it will say something like:

Transfer locked until 4/8/2014: Contact information change

This is a 60-day automatic lock, and it can be overridden by an email from the registrant contact to

Categories:   Web Methods   Internet Networking


Check Your Blacklists
article #644, updated 1238 days ago

Here’s a great place to do so:

Categories:   Internet Networking   Tools


New FTP client, also does cloud storage systems
article #549, updated 1478 days ago

Looks most interesting:

Categories:   Internet Networking   Tools