Apparatus

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sensors Mode-S transponder

A2B0CD

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N27239 · BOEING 737-800 · operated by UNITED AIRLINES INC

Hex
A2B0CD
Octal
50530315
Decimal
10,662,093
Country
US
Tail
N27239
Type
B738
Broadcasting now · callsign UAL2430 · 6,550 ft
Flights observed
16
Distinct callsigns
8
Country
US
Last broadcast
3h ago

Current position

A2B0CD is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A2B0CD 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 8 distinct

Callsign Airline Flights Last seen
UAL8143 United Airlines 3 2026-04-18
UAL704 United Airlines 3 2026-04-16
UAL467 United Airlines 2 2026-04-16
UAL3882 United Airlines 2 2026-04-16
UAL1967 United Airlines 2 2026-04-17
UAL1793 United Airlines 2 2026-04-17
UAL1531 United Airlines 1 2026-04-17
UAL1496 - 1 2026-04-18

Recent flights last 16

DateFlightRouteTakeoffLandingDuration
2026-04-18 UAL1496 - Apr 18, 14:05 UTCApr 18, 17:35 UTC3h 30m
2026-04-18 UAL8143 ORD → SAT Apr 18, 01:25 UTCApr 18, 02:15 UTC50m
2026-04-17 UAL8143 ORD → SAT Apr 17, 23:25 UTCApr 18, 01:20 UTC1h 55m
2026-04-17 UAL8143 ORD → SAT Apr 17, 22:00 UTCApr 17, 23:20 UTC1h 20m
2026-04-17 UAL1967 DEN → MSN Apr 17, 19:25 UTCApr 17, 19:55 UTC30m
2026-04-17 UAL1967 DEN → MSN Apr 17, 17:25 UTCApr 17, 19:20 UTC1h 55m
2026-04-17 UAL1793 EWR → ORD Apr 17, 15:20 UTCApr 17, 15:35 UTC15m
2026-04-17 UAL1793 EWR → ORD Apr 17, 14:20 UTCApr 17, 15:37 UTC1h 17m
2026-04-17 UAL1531 ORD → CMH Apr 17, 01:25 UTCApr 17, 02:35 UTC1h 10m
2026-04-16 UAL467 BOS → DEN Apr 16, 23:20 UTCApr 16, 23:35 UTC15m
2026-04-16 UAL467 BOS → DEN Apr 16, 22:34 UTCApr 16, 23:10 UTC35m
2026-04-16 UAL704 IAH → EWR Apr 16, 19:15 UTCApr 16, 19:55 UTC40m
2026-04-16 UAL704 IAH → EWR Apr 16, 17:15 UTCApr 16, 19:10 UTC1h 55m
2026-04-16 UAL704 IAH → EWR Apr 16, 16:45 UTCApr 16, 17:10 UTC25m
2026-04-16 UAL3882 FTW → SFO Apr 16, 15:15 UTCApr 16, 15:35 UTC20m
2026-04-16 UAL3882 FTW → SFO Apr 16, 15:08 UTCApr 16, 15:38 UTC30m

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 N27239 page for operator, model, and routing details .

Mode-S A2B0CD frequently asked

What is Mode-S code A2B0CD?
A2B0CD is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N27239.
Where is Mode-S A2B0CD registered?
Mode-S code A2B0CD 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 A2B0CD broadcasting right now?
Yes. Mode-S A2B0CD is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2B0CD, octal 50530315, decimal 10,662,093.
What flights does A2B0CD operate?
Mode-S A2B0CD has broadcast 8 distinct callsigns, including UAL8143, UAL704, UAL467, UAL3882, UAL1967.