Apparatus

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sensors Mode-S transponder

A53B38

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N436UP · BOEING 757-200 · operated by UNITED PARCEL SERVICE CO

Hex
A53B38
Octal
51235470
Decimal
10,828,600
Country
US
Tail
N436UP
Type
B752
No current signal · last broadcast 3h ago
Flights observed
239
Distinct callsigns
20
Country
US
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S A53B38.

Country allocation

The ICAO 24-bit address A53B38 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
UPS1347 United Parcel Service 8 2026-06-02
UPS7885 United Parcel Service 7 2026-06-10
UPS674 United Parcel Service 6 2026-06-10
UPS5758 - 6 2026-06-30
UPS5365 - 6 2026-07-03
UPS1364 - 6 2026-07-03
UPS785 - 5 2026-06-30
UPS1376 - 5 2026-07-08
UPS1316 United Parcel Service 5 2026-05-29
UPS1134 United Parcel Service 5 2026-06-04
UPS943 United Parcel Service 4 2026-06-12
UPS7818 United Parcel Service 4 2026-06-11
UPS682 - 4 2026-07-02
UPS610 United Parcel Service 4 2026-06-03
UPS598 - 4 2026-06-30
UPS5961 United Parcel Service 4 2026-04-22
UPS5847 - 4 2026-06-30
UPS2671 United Parcel Service 4 2026-07-02
UPS1445 - 4 2026-06-18
UPS1375 - 4 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UPS1299 - Jul 14, 03:00 UTCJul 14, 04:45 UTC1h 45m
2026-07-10 UPS1128 - Jul 10, 08:25 UTCJul 10, 09:55 UTC1h 30m
2026-07-10 UPS1128 SDF → PVD Jul 10, 08:13 UTCJul 10, 10:08 UTC1h 55m
2026-07-10 UPS1375 - Jul 10, 01:50 UTCJul 10, 02:35 UTC45m
2026-07-08 UPS1376 - Jul 8, 09:10 UTCJul 8, 09:40 UTC30m
2026-07-08 UPS1376 SDF → TYS Jul 8, 09:04 UTCJul 8, 09:41 UTC37m
2026-07-08 UPS705 - Jul 8, 02:30 UTCJul 8, 04:00 UTC1h 30m
2026-07-08 UPS705 LFT → SDF Jul 8, 02:21 UTCJul 8, 03:58 UTC1h 37m
2026-07-07 UPS706 - Jul 7, 09:15 UTCJul 7, 10:40 UTC1h 25m
2026-07-07 UPS706 SDF → LFT Jul 7, 09:16 UTCJul 7, 10:43 UTC1h 27m
2026-07-03 UPS5365 - Jul 3, 13:25 UTCJul 3, 14:00 UTC35m
2026-07-03 UPS5365 PNS → SDF Jul 3, 13:27 UTCJul 3, 14:41 UTC1h 14m
2026-07-03 UPS1364 SDF → PNS Jul 3, 09:05 UTCJul 3, 10:15 UTC1h 10m
2026-07-03 UPS1364 SDF → PNS Jul 3, 09:03 UTCJul 3, 10:13 UTC1h 10m
2026-07-03 UPS7828 - Jul 3, 02:55 UTCJul 3, 04:15 UTC1h 20m
2026-07-03 UPS7828 OMA → SDF Jul 3, 02:52 UTCJul 3, 04:12 UTC1h 20m
2026-07-02 UPS2682 - Jul 2, 21:25 UTCJul 2, 22:15 UTC50m
2026-07-02 UPS2671 OMA → RFD Jul 2, 13:05 UTCJul 2, 13:45 UTC40m
2026-07-02 UPS2671 OMA → RFD Jul 2, 12:58 UTCJul 2, 13:55 UTC57m
2026-07-02 UPS682 - Jul 2, 09:05 UTCJul 2, 10:00 UTC55m
2026-07-02 UPS682 RFD → OMA Jul 2, 09:06 UTCJul 2, 09:59 UTC53m
2026-07-02 UPS987 - Jul 2, 02:40 UTCJul 2, 05:55 UTC3h 15m
2026-07-01 UPS5980 DFW → BFI Jul 1, 18:30 UTCJul 1, 22:10 UTC3h 40m
2026-07-01 UPS5980 DFW → BFI Jul 1, 18:27 UTCJul 1, 21:55 UTC3h 28m
2026-07-01 UPS2791 SAT → DFW Jul 1, 12:05 UTCJul 1, 12:55 UTC50m
2026-07-01 UPS2791 SAT → DFW Jul 1, 12:00 UTCJul 1, 12:50 UTC50m
2026-06-30 UPS5758 - Jun 30, 19:50 UTCJun 30, 22:10 UTC2h 20m
2026-06-30 UPS5758 RFD → SAT Jun 30, 19:53 UTCJun 30, 22:03 UTC2h 10m
2026-06-30 UPS5847 - Jun 30, 14:20 UTCJun 30, 16:00 UTC1h 40m
2026-06-30 UPS5847 SLC → RFD Jun 30, 14:12 UTCJun 30, 16:37 UTC2h 25m
2026-06-30 UPS9821 - Jun 30, 11:55 UTCJun 30, 12:55 UTC1h 0m
2026-06-30 UPS9821 BIL → SLC Jun 30, 11:51 UTCJun 30, 12:50 UTC59m
2026-06-30 UPS598 - Jun 30, 09:15 UTCJun 30, 11:00 UTC1h 45m
2026-06-30 UPS598 ONT → BIL Jun 30, 09:15 UTCJun 30, 11:02 UTC1h 47m
2026-06-30 UPS785 - Jun 30, 02:25 UTCJun 30, 03:50 UTC1h 25m
2026-06-30 UPS785 ELP → ONT Jun 30, 02:23 UTCJun 30, 03:47 UTC1h 24m
2026-06-27 UPS5796 - Jun 27, 23:29 UTCJun 28, 02:14 UTC2h 45m
2026-06-27 UPS5796 SDF → ELP Jun 27, 23:29 UTCJun 28, 02:14 UTC2h 45m
2026-06-26 UPS1447 CLE → SDF Jun 26, 00:45 UTCJun 26, 01:34 UTC50m
2026-06-24 UPS1442 SDF → CLE Jun 24, 09:00 UTCJun 24, 09:45 UTC45m
2026-06-24 UPS1447 CLE → SDF Jun 24, 00:40 UTCJun 24, 01:30 UTC50m
2026-06-23 UPS5442 SDF → CLE Jun 23, 21:39 UTCJun 23, 22:29 UTC50m
2026-06-23 UPS1315 - Jun 23, 02:09 UTCJun 23, 03:15 UTC1h 5m
2026-06-22 UPS9888 - Jun 22, 23:20 UTCJun 22, 23:45 UTC25m
2026-06-19 UPS1198 - Jun 19, 07:19 UTCJun 19, 08:34 UTC1h 15m
2026-06-19 UPS1153 - Jun 19, 02:14 UTCJun 19, 03:05 UTC50m
2026-06-18 UPS1154 - Jun 18, 08:05 UTCJun 18, 08:50 UTC45m
2026-06-18 UPS1154 PHL → PIT Jun 18, 08:04 UTCJun 18, 08:50 UTC46m
2026-06-18 UPS1445 - Jun 18, 02:00 UTCJun 18, 02:55 UTC55m
2026-06-18 UPS1445 CLE → PHL Jun 18, 01:47 UTCJun 18, 02:54 UTC1h 7m

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 N436UP page for operator, model, and routing details .

Mode-S A53B38 frequently asked

What is Mode-S code A53B38?
A53B38 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N436UP.
Where is Mode-S A53B38 registered?
Mode-S code A53B38 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 A53B38 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A53B38, octal 51235470, decimal 10,828,600.
What flights does A53B38 operate?
Mode-S A53B38 has broadcast 20 distinct callsigns, including UPS1347, UPS7885, UPS674, UPS5758, UPS5365.