New Mode-S monitor codes ?

[Tristar500]

From late April to mid-May I picked-up hex code 425850 nearly every day, always in the early hours of the morning, & always with an identical 'First/Last' position that locates it on or immediately in front of, the new Control Tower at Manchester Airport.

Over the last couple of days I have received codes 425851 & 425852, again in the wee small hours, & with positions that seem to be on or around the old Control Tower and at an aerial farm behind the southside Fire station at Manchester.

I am located in Crewe but I don't normally receive 'ground' transmission from Manchester so these are quite unusual and the transmitters must be mounted quite high up.

Has anyone else picked them up ?

[Conexia]

Good morning.
Maybe you can find more info here https://www.secret-bases.co.uk/aircraft/425850
Greetings

[mhm]

Ime getting them in Northwich, they seem to be vehicular movements around the airfield vary from time to time with different callsigns
4258BE RANGER 1
4258BF RANGER 2
4258C0 RANGER 3
4258C1 RANGER 4
4258C2 RANGER 5
4258C3 RANGER 6
4258C5 RANGER 8
4258B8 SEC 2
4258CB SEC 5
4258D0 LIGHT 9
4258D5 LIGHT 4
4258D7 LIGHT 12
4258D8 SWEEPER 1
4258D9 SWEEPER 2
4258EB MAINT 1
4235EC GRASS 1
425850 GRD
425851 UNID VEHICLE POSS SHUNTER
425852 UNID VEHICLE POSS SHUNTER
425854 UNID VEHICLE POSS SHUNTER
425855 UNID VEHICLE POSS SHUNTER
These are a few I have found to date