The nasa spaceflight website states that it will soon shut down.
I don't know how long this disclaimer has been there so maybe this is nothing to worry about...
In any case, which different ways do exist to get real-time data of the ISS-trajectory?
Links to the OEMs and more details to follow.
Which hopefully means those will be posted before the page is taken down.
If not, JPL Horizons can provide ephemerides for the ISS.
Its interface has a bit of a learning curve, so it may be a good idea to start playing with it now, in case you have a regular need for ISS trajectory data. Lots of other data is available through Horizons, so learning to use it is time well spent.