Apparatus

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sensors Mode-S transponder

A4DAB6

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N41135 · BOEING 757-200 · operated by UNITED AIRLINES INC

Hex
A4DAB6
Octal
51155266
Decimal
10,803,894
Country
US
Tail
N41135
Type
B752
Broadcasting now · callsign UAL350 · 39,000 ft
Flights observed
255
Distinct callsigns
20
Country
US
Last broadcast
4h ago

Current position

A4DAB6 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A4DAB6 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
UAL2641 United Airlines 8 2026-07-01
UAL228 - 8 2026-07-12
UAL1095 - 8 2026-06-14
UAL978 - 7 2026-07-11
UAL336 - 7 2026-06-14
UAL316 - 7 2026-07-12
UAL2359 United Airlines 7 2026-05-15
UAL229 - 7 2026-07-10
UAL712 United Airlines 6 2026-06-05
UAL350 - 6 2026-07-13
UAL2434 - 6 2026-07-04
UAL979 - 5 2026-07-11
UAL2743 - 5 2026-07-01
UAL271 United Airlines 5 2026-07-05
UAL270 - 5 2026-07-05
UAL2127 - 5 2026-07-04
UAL1758 United Airlines 5 2026-05-28
UAL1209 United Airlines 5 2026-05-08
UAL311 - 4 2026-06-16
UAL281 - 4 2026-06-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 UAL350 EWR → AGP Jul 13, 23:20 UTCJul 14, 06:15 UTC6h 55m
2026-07-13 UAL350 - Jul 13, 23:10 UTCJul 13, 23:30 UTC20m
2026-07-13 UAL239 OPO → EWR Jul 13, 08:25 UTCJul 13, 14:55 UTC6h 30m
2026-07-13 UAL239 OPO → EWR Jul 13, 08:01 UTCJul 13, 15:00 UTC7h 0m
2026-07-12 UAL238 - Jul 12, 23:40 UTCJul 13, 05:55 UTC6h 15m
2026-07-12 UAL316 - Jul 12, 13:10 UTCJul 12, 13:55 UTC45m
2026-07-12 UAL316 DUB → EWR Jul 12, 12:46 UTCJul 12, 19:50 UTC7h 4m
2026-07-12 UAL228 IAD → DUB Jul 12, 04:05 UTCJul 12, 10:20 UTC6h 15m
2026-07-11 UAL979 EDI → IAD Jul 11, 12:05 UTCJul 11, 19:30 UTC7h 25m
2026-07-11 UAL978 IAD → EDI Jul 11, 02:35 UTCJul 11, 09:10 UTC6h 35m
2026-07-10 UAL229 - Jul 10, 11:50 UTCJul 10, 12:40 UTC50m
2026-07-10 UAL229 DUB → IAD Jul 10, 11:51 UTCJul 10, 19:25 UTC7h 34m
2026-07-10 UAL228 IAD → DUB Jul 10, 03:15 UTCJul 10, 09:25 UTC6h 10m
2026-07-09 UAL336T SFO → SAN Jul 9, 18:25 UTCJul 9, 22:55 UTC4h 30m
2026-07-06 UAL1777 - Jul 6, 12:35 UTCJul 6, 18:00 UTC5h 25m
2026-07-06 UAL698 SFO → EWR Jul 6, 04:35 UTCJul 6, 09:30 UTC4h 55m
2026-07-05 UAL2080 EWR → SFO Jul 5, 21:00 UTCJul 6, 02:25 UTC5h 25m
2026-07-05 UAL271 ATL → EWR Jul 5, 11:40 UTCJul 5, 12:15 UTC35m
2026-07-05 UAL271 ATL → EWR Jul 5, 11:42 UTCJul 5, 18:31 UTC6h 49m
2026-07-05 UAL270 - Jul 5, 04:20 UTCJul 5, 09:45 UTC5h 25m
2026-07-04 UAL2127 LAX → EWR Jul 4, 17:30 UTCJul 4, 22:40 UTC5h 10m
2026-07-04 UAL2434 - Jul 4, 10:20 UTCJul 4, 15:35 UTC5h 15m
2026-07-04 UAL2626 SFO → EWR Jul 4, 03:10 UTCJul 4, 08:05 UTC4h 55m
2026-07-03 UAL2080 - Jul 3, 20:15 UTCJul 4, 01:50 UTC5h 35m
2026-07-03 UAL1403 - Jul 3, 13:15 UTCJul 3, 18:25 UTC5h 10m
2026-07-03 UAL1403 LAX → EWR Jul 3, 13:18 UTCJul 3, 18:15 UTC4h 57m
2026-07-01 UAL2641 SFO → SAN Jul 1, 22:00 UTCJul 2, 03:20 UTC5h 20m
2026-07-01 UAL2743 - Jul 1, 14:10 UTCJul 1, 19:10 UTC5h 0m
2026-06-30 UAL2191 - Jun 30, 18:30 UTCJun 30, 23:50 UTC5h 20m
2026-06-30 UAL351 - Jun 30, 07:45 UTCJun 30, 08:55 UTC1h 10m
2026-06-30 UAL351 AGP → EWR Jun 30, 07:52 UTCJun 30, 15:35 UTC7h 43m
2026-06-29 UAL350 EWR → AGP Jun 29, 22:35 UTCJun 30, 05:21 UTC6h 46m
2026-06-29 UAL350 - Jun 29, 22:30 UTCJun 30, 05:25 UTC6h 56m
2026-06-29 UAL282 FAO → EWR Jun 29, 10:44 UTCJun 29, 18:25 UTC7h 40m
2026-06-29 UAL281 - Jun 29, 02:09 UTCJun 29, 03:25 UTC1h 15m
2026-06-29 UAL281 EWR → EWR Jun 29, 01:50 UTCJun 29, 01:55 UTC5m
2026-06-29 UAL281 EWR → FAO Jun 29, 02:00 UTCJun 29, 08:37 UTC6h 37m
2026-06-28 UAL1968 - Jun 28, 21:20 UTCJun 28, 22:55 UTC1h 35m
2026-06-28 UAL1968 ORD → EWR Jun 28, 21:33 UTCJun 28, 22:52 UTC1h 19m
2026-06-28 UAL913 KEF → ORD Jun 28, 12:09 UTCJun 28, 18:10 UTC6h 0m
2026-06-28 UAL912 ORD → KEF Jun 28, 03:35 UTCJun 28, 09:20 UTC5h 45m
2026-06-27 UAL119 ORD → EDI Jun 27, 11:20 UTCJun 27, 19:00 UTC7h 40m
2026-06-27 UAL978 IAD → EDI Jun 27, 02:30 UTCJun 27, 09:08 UTC6h 38m
2026-06-27 UAL978 IAD → EDI Jun 27, 02:45 UTCJun 27, 09:15 UTC6h 30m
2026-06-26 UAL979 EDI → IAD Jun 26, 12:39 UTCJun 26, 20:04 UTC7h 25m
2026-06-26 UAL118 ORD → EDI Jun 26, 10:20 UTCJun 26, 10:30 UTC10m
2026-06-26 UAL118 ORD → EDI Jun 26, 00:24 UTCJun 26, 08:15 UTC7h 50m
2026-06-25 UAL2788 ORD → ORD Jun 25, 20:54 UTCJun 25, 20:59 UTC5m
2026-06-25 UAL2788 EWR → ORD Jun 25, 19:08 UTCJun 25, 20:39 UTC1h 31m
2026-06-25 UAL2788 EWR → ORD Jun 25, 18:59 UTCJun 25, 20:59 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 N41135 page for operator, model, and routing details .

Mode-S A4DAB6 frequently asked

What is Mode-S code A4DAB6?
A4DAB6 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N41135.
Where is Mode-S A4DAB6 registered?
Mode-S code A4DAB6 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 A4DAB6 broadcasting right now?
Yes. Mode-S A4DAB6 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4DAB6, octal 51155266, decimal 10,803,894.
What flights does A4DAB6 operate?
Mode-S A4DAB6 has broadcast 20 distinct callsigns, including UAL2641, UAL228, UAL1095, UAL978, UAL336.