At a cmd prompt you can use
That will give you IP's and MAC's but no names. Note that it will also list any machines you are connected to on the internet at that time, so don't freak out is you see an IP listed that you don't recognize. You can then run
and it will give you the machine name of that IP. You will have to run tracert for each IP so it will be a little work. May or may not be easier than going to each machine and simply looking at the IP address.
Another way is to use Wireshark, while you have it capturing network activity go into your network and connect to a machine and you will be able to see the IP that it is connecting to.
There are tools out there that do what you want and more, but they are more along the lines of hacker tools so they don't get mentioned out in the open too often.
Ultimate Edition Linux
AMD FX 8350
Asus Sabertooth 990FX R2.0
24GB GSkill/Corsair 1866MHz
EVGA GTX 970 SSC/ GTX 650 (PhysX)
SSD - OCZ V4 128GB/Kingston 120GB
HDD - 3TB/2x 750GB/500GB
CM HAF 932 Red
CM Hyper 212 EVO w/2x 120mm Red
Logitech X540 5.1
2X Acer 23" LED - Surround: 3840x1080
Microsoft Sidewinder x4 KB
"The significant problems we face cannot be solved at the same level of thinking we were at when we created them."
- Albert Einstein