Apparatus

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sensors Mode-S transponder

A51770

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N427UP · BOEING 757-200 · operated by UNITED PARCEL SERVICE CO

Hex
A51770
Octal
51213560
Decimal
10,819,440
Country
US
Tail
N427UP
Type
B752
No current signal · last broadcast 4h ago
Flights observed
169
Distinct callsigns
9
Country
US
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S A51770.

Country allocation

The ICAO 24-bit address A51770 falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 9 distinct

Callsign Airline Flights Last seen
UPS295 - 47 2026-07-13
UPS294 - 42 2026-07-13
UPS282 - 34 2026-07-14
UPS283 - 31 2026-07-10
UPS273 - 6 2026-07-06
UPS272 - 6 2026-07-06
UPS6382 United Parcel Service 1 2026-05-24
UPS6295 - 1 2026-07-05
UPS293 - 1 2026-05-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UPS282 CGN → ARN Jul 14, 02:00 UTCJul 14, 03:40 UTC1h 40m
2026-07-13 UPS295 PRG → CGN Jul 13, 21:25 UTCJul 13, 22:40 UTC1h 15m
2026-07-13 UPS295 BUD → PRG Jul 13, 19:00 UTCJul 13, 19:45 UTC45m
2026-07-13 UPS294 PRG → BUD Jul 13, 02:40 UTCJul 13, 03:25 UTC45m
2026-07-13 UPS294 CGN → PRG Jul 13, 00:45 UTCJul 13, 01:30 UTC45m
2026-07-10 UPS283 ARN → CGN Jul 10, 20:20 UTCJul 10, 21:55 UTC1h 35m
2026-07-10 UPS282 CGN → ARN Jul 10, 02:15 UTCJul 10, 03:55 UTC1h 40m
2026-07-09 UPS283 ARN → CGN Jul 9, 21:10 UTCJul 9, 22:50 UTC1h 40m
2026-07-09 UPS282 CGN → ARN Jul 9, 02:05 UTCJul 9, 03:50 UTC1h 45m
2026-07-08 UPS295 PRG → CGN Jul 8, 21:10 UTCJul 8, 22:00 UTC50m
2026-07-08 UPS295 PRG → CGN Jul 8, 19:00 UTCJul 8, 19:50 UTC50m
2026-07-08 UPS294 PRG → BUD Jul 8, 03:55 UTCJul 8, 04:40 UTC45m
2026-07-08 UPS294 CGN → PRG Jul 8, 02:10 UTCJul 8, 03:00 UTC50m
2026-07-07 UPS295 PRG → CGN Jul 7, 21:05 UTCJul 7, 22:00 UTC55m
2026-07-07 UPS295 PRG → CGN Jul 7, 19:05 UTCJul 7, 19:55 UTC50m
2026-07-07 UPS294 PRG → BUD Jul 7, 03:55 UTCJul 7, 04:40 UTC45m
2026-07-07 UPS294 CGN → PRG Jul 7, 02:00 UTCJul 7, 02:50 UTC50m
2026-07-06 UPS273 WAW → CGN Jul 6, 19:20 UTCJul 6, 20:45 UTC1h 25m
2026-07-06 UPS272 CGN → WAW Jul 6, 02:10 UTCJul 6, 03:30 UTC1h 20m
2026-07-05 UPS6295 PRG → CGN Jul 5, 16:25 UTCJul 5, 17:20 UTC55m
2026-07-03 UPS295 PRG → CGN Jul 3, 19:05 UTCJul 3, 20:00 UTC55m
2026-07-03 UPS294 PRG → BUD Jul 3, 03:50 UTCJul 3, 04:45 UTC55m
2026-07-03 UPS294 CGN → PRG Jul 3, 02:00 UTCJul 3, 02:50 UTC50m
2026-07-02 UPS283 ARN → CGN Jul 2, 20:10 UTCJul 2, 22:05 UTC1h 55m
2026-07-02 UPS282 CGN → ARN Jul 2, 02:15 UTCJul 2, 03:50 UTC1h 35m
2026-07-01 UPS295 PRG → CGN Jul 1, 21:30 UTCJul 1, 22:25 UTC55m
2026-07-01 UPS295 PRG → CGN Jul 1, 19:25 UTCJul 1, 20:10 UTC45m
2026-07-01 UPS294 - Jul 1, 04:30 UTCJul 1, 05:15 UTC45m
2026-07-01 UPS294 CGN → PRG Jul 1, 02:10 UTCJul 1, 03:05 UTC55m
2026-06-30 UPS283 ARN → CGN Jun 30, 20:30 UTCJun 30, 22:35 UTC2h 5m
2026-06-30 UPS282 CGN → ARN Jun 30, 02:10 UTCJun 30, 03:45 UTC1h 35m
2026-06-29 UPS295 PRG → CGN Jun 29, 21:50 UTCJun 29, 22:39 UTC50m
2026-06-29 UPS294 CGN → PRG Jun 29, 02:20 UTCJun 29, 03:25 UTC1h 5m
2026-06-25 UPS283 ARN → CGN Jun 25, 20:19 UTCJun 25, 22:04 UTC1h 45m
2026-06-25 UPS282 CGN → ARN Jun 25, 02:19 UTCJun 25, 03:54 UTC1h 35m
2026-06-24 UPS283 ARN → CGN Jun 24, 20:30 UTCJun 24, 22:19 UTC1h 50m
2026-06-24 UPS282 CGN → ARN Jun 24, 02:24 UTCJun 24, 04:05 UTC1h 40m
2026-06-23 UPS283 ARN → CGN Jun 23, 20:15 UTCJun 23, 21:59 UTC1h 45m
2026-06-23 UPS282 CGN → ARN Jun 23, 02:24 UTCJun 23, 04:05 UTC1h 40m
2026-06-22 UPS273 - Jun 22, 19:34 UTCJun 22, 21:00 UTC1h 25m
2026-06-22 UPS272 CGN → WAW Jun 22, 02:14 UTCJun 22, 03:35 UTC1h 20m
2026-06-18 UPS283 ARN → CGN Jun 18, 20:25 UTCJun 18, 22:20 UTC1h 55m
2026-06-18 UPS282 CGN → ARN Jun 18, 02:10 UTCJun 18, 03:50 UTC1h 40m
2026-06-17 UPS283 ARN → CGN Jun 17, 20:20 UTCJun 17, 22:05 UTC1h 45m
2026-06-17 UPS282 CGN → ARN Jun 17, 02:15 UTCJun 17, 04:00 UTC1h 45m
2026-06-16 UPS283 ARN → CGN Jun 16, 20:25 UTCJun 16, 22:05 UTC1h 40m
2026-06-16 UPS282 - Jun 16, 03:39 UTCJun 16, 04:00 UTC20m
2026-06-16 UPS282 - Jun 16, 02:20 UTCJun 16, 03:35 UTC1h 15m
2026-06-15 UPS273 - Jun 15, 19:30 UTCJun 15, 20:54 UTC1h 25m
2026-06-15 UPS272 CGN → WAW Jun 15, 03:05 UTCJun 15, 04:25 UTC1h 20m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the N427UP page for operator, model, and routing details .

Mode-S A51770 frequently asked

What is Mode-S code A51770?
A51770 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N427UP.
Where is Mode-S A51770 registered?
Mode-S code A51770 is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A51770 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A51770, octal 51213560, decimal 10,819,440.
What flights does A51770 operate?
Mode-S A51770 has broadcast 9 distinct callsigns, including UPS295, UPS294, UPS282, UPS283, UPS273.