"...try looking up a directory?" If Jingyi's interested in the numbers, then what else has access to numbers? It comes after a moment of thought, wondering if they would be freely available, or available to the public. But if they were able to look up about planets and locations by their system numbers...

"You can get lists like that in collections. Dunno if anything would exist for void numbers, but if people move around to different planets - you might find something looking up something like that?"

That or searching for travel magazines, and getting numbers at random.