Adding back some Left 4 Dead servers that I have, I realized that the complete list does not appear on the page and opening the game only one of the three servers that I have running appears.
These are the IPs:
22.214.171.124:27005 DSLive | Versus #2 | 126.96.36.199
188.8.131.52:27015 DSLive | Versus #3 | 184.108.40.206
220.127.116.11:27020 DSLive | Versus #4 | 18.104.22.168