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Thanks for your help. Olivier F5MZN and Laurent F6FVY

Task #337 — Default broadcast address not calculated properly for with subnet mask

Attached to Project— Win-Test
Opened by Robert A. Wilson (N6TV) - Wednesday, 4 Dec 2013, 9:02am
Bug Report
Current WT-4.x
0% complete

WT 4.11.0

On a machine where IPCONFIG returns:

Ethernet adapter Ethernet LAN:

IPv4 Address. . . . . . . . . . . : Subnet Mask . . . . . . . . . . . : Default Gateway . . . . . . . . . :

  1. Type SETUP [Enter] in the Win-Test logging window
  2. Check "Enable Ethernet Network"
  3. Next to "Broadcast address", click the "By Default" button

Win-Test changes the broadcast address to, but this doesn't seem to work.

According to the Online IP Subnet Calculator (

with the Subnet mask set to, the correct broadcast address is Manually setting this broadcast address in Win-Test SETUP seems to work fine; all computers on the LAN will talk to each other OK.

This task depends upon

This task blocks these from closing

Comments (2) | Attachments (0) | Related Tasks (0/0) | Notifications (3) | Reminders (0) | History |

Comment by F6FVY - Wednesday, 4 Dec 2013, 10:09pm

Win-Test is not aware of the subnet mask used. It is assumed from the class the of private network indicated by the IP. A 10.x.y.z address is supposed to be on a class A network whose default netmask is, allowing 16 777 216 computers. A nice M/M setup...

Comment by Robert A. Wilson - Wednesday, 4 Dec 2013, 10:49pm

Unfortunately one of the most common cable modem / router boxes now shipping in the USA (by Comcast) assigns itself to the private network by default, with the netmask shown above. For routers, it all works OK as-is.

Perhaps the "by default" button should just take the IP address x.x.x.y and use x.x.x.255 as the default broadcast address?