electrum-bitcoinprivate/lib/servers_testnet.json

{
        "testnetnode.arihanc.com": {"t":"51001", "s":"51002"},
        "testnet1.bauerj.eu": {"t":"51001", "s":"51002"},
        "14.3.140.101": {"t":"51001", "s":"51002"},
        "testnet.hsmiths.com": {"t":"53011", "s":"53012"},
        "electrum.akinbo.org": {"t":"51001", "s":"51002"},
        "ELEX05.blackpole.online": {"t":"52011", "s":"52002"}
}