Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A55F00

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N445UP · BOEING 757-200 · operated by WILMINGTON TRUST CO OWNER TRUSTEE

Hex
A55F00
Octal
51257400
Decimal
10,837,760
Country
US
Tail
N445UP
Type
B752
No current signal · last broadcast 15h ago
Flights observed
220
Distinct callsigns
20
Country
US
Last broadcast
15h ago

Last known position

Most recent position reported by Mode-S A55F00.

Country allocation

The ICAO 24-bit address A55F00 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 20 distinct

Callsign Airline Flights Last seen
UPS1274 - 9 2026-06-18
UPS1273 - 8 2026-06-19
UPS837 United Parcel Service 6 2026-04-18
UPS1134 - 5 2026-07-17
UPS996 United Parcel Service 4 2026-05-22
UPS1446 - 4 2026-06-30
UPS1351 United Parcel Service 4 2026-05-12
UPS1333 - 4 2026-06-23
UPS1222 United Parcel Service 4 2026-05-13
UPS1198 - 4 2026-07-01
UPS1154 United Parcel Service 4 2026-06-04
UPS796 United Parcel Service 3 2026-06-10
UPS795 United Parcel Service 3 2026-06-11
UPS7828 - 3 2026-06-26
UPS706 United Parcel Service 3 2026-06-02
UPS705 United Parcel Service 3 2026-06-03
UPS682 United Parcel Service 3 2026-05-15
UPS582 - 3 2026-06-25
UPS2784 United Parcel Service 3 2026-04-14
UPS2682 - 3 2026-06-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 UPS1134 - Jul 17, 08:35 UTCJul 17, 08:59 UTC25m
2026-07-17 UPS1134 - Jul 17, 07:14 UTCJul 17, 08:00 UTC45m
2026-07-15 UPS2020 DFW → PHL Jul 15, 21:00 UTCJul 15, 23:55 UTC2h 55m
2026-07-15 UPS5357 TPA → DFW Jul 15, 11:35 UTCJul 15, 13:50 UTC2h 15m
2026-07-15 UPS1352 - Jul 15, 07:30 UTCJul 15, 09:25 UTC1h 55m
2026-07-14 UPS2941 OAK → PHL Jul 14, 14:05 UTCJul 14, 19:10 UTC5h 5m
2026-07-14 UPS2941 OAK → PHL Jul 14, 13:36 UTCJul 14, 19:01 UTC5h 25m
2026-07-14 UPS948 - Jul 14, 07:55 UTCJul 14, 11:30 UTC3h 35m
2026-07-14 UPS948 RFD → OAK Jul 14, 07:50 UTCJul 14, 11:25 UTC3h 35m
2026-07-09 UPS9763 - Jul 9, 11:15 UTCJul 9, 13:00 UTC1h 45m
2026-07-09 UPS9763 DEN → RFD Jul 9, 11:12 UTCJul 9, 13:01 UTC1h 49m
2026-07-09 UPS810 - Jul 9, 07:45 UTCJul 9, 09:40 UTC1h 55m
2026-07-09 UPS810 RFD → DEN Jul 9, 07:40 UTCJul 9, 09:29 UTC1h 49m
2026-07-08 UPS5273 - Jul 8, 12:30 UTCJul 8, 14:00 UTC1h 30m
2026-07-08 UPS5273 CLT → RFD Jul 8, 12:33 UTCJul 8, 14:04 UTC1h 31m
2026-07-08 UPS1284 - Jul 8, 07:35 UTCJul 8, 08:40 UTC1h 5m
2026-07-08 UPS1284 PHL → CLT Jul 8, 07:33 UTCJul 8, 08:41 UTC1h 8m
2026-07-08 UPS1323 - Jul 8, 01:15 UTCJul 8, 03:15 UTC2h 0m
2026-07-07 UPS9745 - Jul 7, 09:10 UTCJul 7, 10:25 UTC1h 15m
2026-07-07 UPS9745 RDU → MCO Jul 7, 09:08 UTCJul 7, 10:23 UTC1h 15m
2026-07-07 UPS1278 - Jul 7, 07:05 UTCJul 7, 08:00 UTC55m
2026-07-07 UPS1278 SDF → RDU Jul 7, 07:06 UTCJul 7, 08:02 UTC56m
2026-07-07 UPS671 - Jul 7, 02:05 UTCJul 7, 03:30 UTC1h 25m
2026-07-07 UPS671 ICT → SDF Jul 7, 02:04 UTCJul 7, 03:26 UTC1h 22m
2026-07-03 UPS672 - Jul 3, 09:15 UTCJul 3, 10:40 UTC1h 25m
2026-07-03 UPS672 SDF → ICT Jul 3, 09:13 UTCJul 3, 10:40 UTC1h 27m
2026-07-03 UPS495 YWG → SDF Jul 3, 00:35 UTCJul 3, 02:45 UTC2h 10m
2026-07-02 UPS496 MSP → YWG Jul 2, 11:35 UTCJul 2, 12:35 UTC1h 0m
2026-07-02 UPS496 MSP → YWG Jul 2, 11:35 UTCJul 2, 12:41 UTC1h 6m
2026-07-02 UPS554 SDF → MSP Jul 2, 06:55 UTCJul 2, 08:25 UTC1h 30m
2026-07-02 UPS554 SDF → MSP Jul 2, 06:58 UTCJul 2, 08:32 UTC1h 34m
2026-07-02 UPS1291 - Jul 2, 01:10 UTCJul 2, 02:00 UTC50m
2026-07-01 UPS1198 - Jul 1, 07:20 UTCJul 1, 08:25 UTC1h 5m
2026-07-01 UPS1198 PHL → CAE Jul 1, 07:23 UTCJul 1, 08:31 UTC1h 8m
2026-07-01 UPS1445 - Jul 1, 01:45 UTCJul 1, 02:40 UTC55m
2026-06-30 UPS1446 - Jun 30, 08:45 UTCJun 30, 09:35 UTC50m
2026-06-30 UPS1446 RFD → CLE Jun 30, 08:42 UTCJun 30, 09:41 UTC59m
2026-06-30 UPS1387 - Jun 30, 03:45 UTCJun 30, 04:50 UTC1h 5m
2026-06-30 UPS1387 MEM → RFD Jun 30, 03:46 UTCJun 30, 04:56 UTC1h 10m
2026-06-28 UPS5384 - Jun 28, 22:29 UTCJun 28, 23:14 UTC45m
2026-06-28 UPS5384 SDF → MEM Jun 28, 22:26 UTCJun 28, 23:20 UTC54m
2026-06-27 UPS321 - Jun 27, 02:14 UTCJun 27, 05:25 UTC3h 10m
2026-06-26 UPS320 - Jun 26, 10:55 UTCJun 26, 13:55 UTC3h 0m
2026-06-26 UPS7828 - Jun 26, 02:50 UTCJun 26, 04:04 UTC1h 15m
2026-06-25 UPS2682 - Jun 25, 20:45 UTCJun 25, 21:40 UTC55m
2026-06-25 UPS7891 - Jun 25, 15:50 UTCJun 25, 16:50 UTC1h 0m
2026-06-25 UPS582 FSD → FAR Jun 25, 13:45 UTCJun 25, 14:24 UTC40m
2026-06-25 UPS582 FSD → FAR Jun 25, 13:45 UTCJun 25, 14:25 UTC40m
2026-06-25 UPS582 - Jun 25, 08:45 UTCJun 25, 12:19 UTC3h 35m
2026-06-24 UPS757 LBB → SDF Jun 24, 03:00 UTCJun 24, 04:55 UTC1h 55m

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 N445UP page for operator, model, and routing details .

Mode-S A55F00 frequently asked

What is Mode-S code A55F00?
A55F00 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N445UP.
Where is Mode-S A55F00 registered?
Mode-S code A55F00 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 A55F00 broadcasting right now?
No active broadcast right now. Last signal was 15h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A55F00, octal 51257400, decimal 10,837,760.
What flights does A55F00 operate?
Mode-S A55F00 has broadcast 20 distinct callsigns, including UPS1274, UPS1273, UPS837, UPS1134, UPS996.