Can't ping server

[maniakovsky]

void getServer() async {
    final server = await ping('mc.hypixel.net');
    if (server == null || server.response == null) return;
    final players = server.response!.players;
    if (kDebugMode) {
      print('Pinged ...');
    }
    if (kDebugMode) {
      print('${players.online} / ${players.max}. ${server.ping}ms.');
    }
    setState(() {
      playersOnline = players;
    });
  }

Error: Unsupported operation: dart:io is required to ping servers.

Even when i import dart:io, it still doesnt work