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:
126.96.36.199:27005 DSLive | Versus #2 | 188.8.131.52
184.108.40.206:27015 DSLive | Versus #3 | 220.127.116.11
18.104.22.168:27020 DSLive | Versus #4 | 22.214.171.124