Apparatus

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sensors Mode-S transponder

A245B7

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N24555 · AIRBUS A-321neo · operated by UNITED AIRLINES INC

Hex
A245B7
Octal
50442667
Decimal
10,634,679
Country
US
Tail
N24555
Type
A21N
Broadcasting now · callsign UAL405 · 34,000 ft
Flights observed
432
Distinct callsigns
20
Country
US
Last broadcast
Jul 24, 04:45 UTC

Current position

A245B7 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A245B7 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
UAL695 - 11 2026-07-09
UAL2354 - 10 2026-07-03
UAL2089 - 10 2026-07-09
UAL1770 - 6 2026-07-03
UAL1714 - 6 2026-06-18
UAL1596 United Airlines 6 2026-06-05
UAL777 - 5 2026-07-18
UAL1954 United Airlines 5 2026-07-23
UAL789 - 4 2026-06-22
UAL675 - 4 2026-07-09
UAL655 United Airlines 4 2026-05-18
UAL596 United Airlines 4 2026-05-19
UAL314 United Airlines 4 2026-05-03
UAL2794 United Airlines 4 2026-06-01
UAL249 United Airlines 4 2026-04-30
UAL2343 United Airlines 4 2026-05-06
UAL2071 - 4 2026-07-13
UAL1924 - 4 2026-06-17
UAL1561 United Airlines 4 2026-06-04
UAL1214 - 4 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 UAL3881 VCV → SFO Jul 24, 02:45 UTCJul 24, 04:45 UTC2h 0m
2026-07-24 UAL3881 VCV → SFO Jul 24, 02:51 UTCJul 24, 04:42 UTC1h 51m
2026-07-23 UAL1954 RDM → SFO Jul 23, 23:10 UTCJul 24, 01:10 UTC2h 0m
2026-07-23 UAL1583 IAH → LGA Jul 23, 17:35 UTCJul 23, 20:40 UTC3h 5m
2026-07-23 UAL2316 DSM → DEN Jul 23, 14:23 UTCJul 23, 15:37 UTC1h 14m
2026-07-23 UAL2316 DSM → DEN Jul 23, 14:15 UTCJul 23, 15:40 UTC1h 25m
2026-07-23 UAL8264 SLC → SFO Jul 23, 03:35 UTCJul 23, 05:35 UTC2h 0m
2026-07-23 UAL8264 SLC → SFO Jul 23, 03:28 UTCJul 23, 05:30 UTC2h 2m
2026-07-22 UAL1954 RDM → SFO Jul 22, 23:15 UTCJul 23, 01:25 UTC2h 10m
2026-07-22 UAL1583 IAH → LGA Jul 22, 17:40 UTCJul 22, 20:50 UTC3h 10m
2026-07-22 UAL2316 DSM → DEN Jul 22, 14:20 UTCJul 22, 15:45 UTC1h 25m
2026-07-22 UAL1874 SFO → IND Jul 22, 11:10 UTCJul 22, 12:30 UTC1h 20m
2026-07-21 UAL1585 - Jul 21, 23:45 UTCJul 22, 01:40 UTC1h 55m
2026-07-21 UAL1565 SFO → PHX Jul 21, 19:55 UTCJul 21, 21:45 UTC1h 50m
2026-07-21 UAL660 EWR → CHS Jul 21, 14:05 UTCJul 21, 17:40 UTC3h 35m
2026-07-20 UAL1998 ORF → ORD Jul 20, 23:45 UTCJul 21, 01:40 UTC1h 55m
2026-07-20 UAL1233 ORD → SFO Jul 20, 18:10 UTCJul 20, 21:20 UTC3h 10m
2026-07-20 UAL1701 PHX → EWR Jul 20, 12:00 UTCJul 20, 15:35 UTC3h 35m
2026-07-19 UAL1715 DEN → EWR Jul 19, 22:15 UTCJul 20, 01:35 UTC3h 20m
2026-07-19 UAL1715 DEN → EWR Jul 19, 22:04 UTCJul 20, 01:34 UTC3h 30m
2026-07-19 UAL1999 EWR → DEN Jul 19, 16:20 UTCJul 19, 19:50 UTC3h 30m
2026-07-19 UAL1999 EWR → DEN Jul 19, 16:17 UTCJul 19, 19:46 UTC3h 29m
2026-07-19 UAL563 SNA → SFO Jul 19, 12:35 UTCJul 19, 14:05 UTC1h 30m
2026-07-19 UAL2320 LAS → ORD Jul 19, 00:55 UTCJul 19, 04:05 UTC3h 10m
2026-07-18 UAL777 - Jul 18, 17:55 UTCJul 18, 20:55 UTC3h 0m
2026-07-18 UAL1617 - Jul 18, 13:25 UTCJul 18, 15:35 UTC2h 10m
2026-07-17 UAL1585 - Jul 17, 23:50 UTCJul 18, 01:45 UTC1h 55m
2026-07-17 UAL577 IAD → DEN Jul 17, 17:50 UTCJul 17, 21:10 UTC3h 20m
2026-07-17 UAL2345 DEN → EWR Jul 17, 12:19 UTCJul 17, 15:29 UTC3h 10m
2026-07-17 UAL1654 IAH → DEN Jul 17, 01:00 UTCJul 17, 02:59 UTC2h 0m
2026-07-17 UAL1654 IAH → DEN Jul 17, 00:50 UTCJul 17, 02:58 UTC2h 8m
2026-07-16 UAL1829 - Jul 16, 20:09 UTCJul 16, 22:19 UTC2h 10m
2026-07-16 UAL1829 IAH → MIA Jul 16, 19:59 UTCJul 16, 22:02 UTC2h 3m
2026-07-16 UAL407 - Jul 16, 02:25 UTCJul 16, 05:45 UTC3h 20m
2026-07-15 UAL1233 - Jul 15, 23:55 UTCJul 16, 00:35 UTC40m
2026-07-15 UAL1233 DEN → SYR Jul 15, 17:55 UTCJul 15, 21:40 UTC3h 45m
2026-07-15 UAL1701 EWR → DEN Jul 15, 12:00 UTCJul 15, 15:20 UTC3h 20m
2026-07-15 UAL1701 EWR → DEN Jul 15, 12:10 UTCJul 15, 15:16 UTC3h 6m
2026-07-15 UAL1745 DEN → EWR Jul 15, 06:12 UTCJul 15, 09:26 UTC3h 14m
2026-07-15 UAL1745 DEN → EWR Jul 15, 06:15 UTCJul 15, 09:30 UTC3h 15m
2026-07-15 UAL2610 - Jul 15, 02:05 UTCJul 15, 04:00 UTC1h 55m
2026-07-14 UAL374 ORD → LAX Jul 14, 20:00 UTCJul 14, 23:45 UTC3h 44m
2026-07-14 UAL1069 - Jul 14, 14:10 UTCJul 14, 17:50 UTC3h 40m
2026-07-14 UAL1531 ORD → SAN Jul 14, 02:15 UTCJul 14, 05:40 UTC3h 25m
2026-07-13 UAL2071 MCO → ORD Jul 13, 21:35 UTCJul 14, 00:00 UTC2h 25m
2026-07-13 UAL2008 ORD → MCO Jul 13, 16:29 UTCJul 13, 18:49 UTC2h 20m
2026-07-13 UAL2008 ORD → MCO Jul 13, 16:30 UTCJul 13, 18:45 UTC2h 15m
2026-07-13 UAL1775 IAD → ORD Jul 13, 12:40 UTCJul 13, 14:05 UTC1h 25m
2026-07-13 UAL2408 DEN → IAD Jul 13, 00:30 UTCJul 13, 03:20 UTC2h 50m
2026-07-12 UAL2803 ORD → DEN Jul 12, 20:05 UTCJul 12, 22:05 UTC2h 0m

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 N24555 page for operator, model, and routing details .

Mode-S A245B7 frequently asked

What is Mode-S code A245B7?
A245B7 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N24555.
Where is Mode-S A245B7 registered?
Mode-S code A245B7 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 A245B7 broadcasting right now?
Yes. Mode-S A245B7 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A245B7, octal 50442667, decimal 10,634,679.
What flights does A245B7 operate?
Mode-S A245B7 has broadcast 20 distinct callsigns, including UAL695, UAL2354, UAL2089, UAL1770, UAL1714.