Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A2B110

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N27256 · BOEING 737 MAX 8 · operated by WILMINGTON TRUST CO TRUSTEE

Hex
A2B110
Octal
50530420
Decimal
10,662,160
Country
US
Tail
N27256
Type
B38M
Broadcasting now · callsign UAL1959 · 35,000 ft
Flights observed
455
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:15 UTC

Current position

A2B110 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A2B110 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
UAL1676 - 11 2026-06-23
UAL359 United Airlines 6 2026-06-17
UAL2153 United Airlines 5 2026-06-07
UAL1675 - 5 2026-06-22
UAL1298 United Airlines 5 2026-06-01
UAL474 - 4 2026-06-17
UAL453 United Airlines 4 2026-04-17
UAL280 United Airlines 4 2026-07-20
UAL278 United Airlines 4 2026-04-17
UAL2663 United Airlines 4 2026-07-25
UAL2448 - 4 2026-06-24
UAL2389 - 4 2026-06-16
UAL2208 - 4 2026-07-16
UAL1717 United Airlines 4 2026-05-16
UAL1579 United Airlines 4 2026-07-24
UAL1172 - 4 2026-06-18
UAL1099 - 4 2026-06-26
UAL598 - 3 2026-07-22
UAL363 United Airlines 3 2026-06-20
UAL3036 United Airlines 3 2026-07-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1864 DEN → IAH Jul 26, 16:40 UTCJul 26, 21:15 UTC4h 35m
2026-07-26 UAL2396 BOS → EWR Jul 26, 12:50 UTCJul 26, 13:35 UTC45m
2026-07-26 UAL572 ORD → MSN Jul 26, 04:40 UTCJul 26, 10:45 UTC6h 6m
2026-07-25 UAL1592 DEN → BOS Jul 25, 22:30 UTCJul 26, 03:25 UTC4h 55m
2026-07-25 UAL2663 PSP → SFO Jul 25, 20:00 UTCJul 25, 20:25 UTC25m
2026-07-25 UAL1378 JAC → DEN Jul 25, 17:35 UTCJul 25, 17:40 UTC5m
2026-07-25 UAL2154 ORD → TPA Jul 25, 12:15 UTCJul 25, 15:50 UTC3h 35m
2026-07-24 UAL1579 MSY → SFO Jul 24, 20:20 UTCJul 24, 23:30 UTC3h 10m
2026-07-24 UAL779 BOS → IAH Jul 24, 16:40 UTCJul 24, 18:20 UTC1h 40m
2026-07-24 UAL1336 SNA → IAH Jul 24, 12:30 UTCJul 24, 14:35 UTC2h 5m
2026-07-24 UAL450J EWR → SRQ Jul 24, 04:28 UTCJul 24, 09:21 UTC4h 53m
2026-07-24 UAL450J EWR → SRQ Jul 24, 04:25 UTCJul 24, 09:40 UTC5h 15m
2026-07-23 UAL2369 MSY → IAH Jul 23, 20:05 UTCJul 24, 03:00 UTC6h 55m
2026-07-23 UAL2189 MSY → ORD Jul 23, 00:39 UTCJul 23, 04:00 UTC3h 21m
2026-07-23 UAL2189 MSY → ORD Jul 23, 01:05 UTCJul 23, 04:00 UTC2h 55m
2026-07-22 UAL2249 PHX → SFO Jul 22, 19:50 UTCJul 22, 22:55 UTC3h 5m
2026-07-22 UAL2249 PHX → SFO Jul 22, 19:40 UTCJul 22, 22:52 UTC3h 12m
2026-07-22 UAL2617 SFO → LAX Jul 22, 14:55 UTCJul 22, 18:00 UTC3h 5m
2026-07-22 UAL2617 SFO → LAX Jul 22, 14:38 UTCJul 22, 17:59 UTC3h 21m
2026-07-22 UAL598 - Jul 22, 02:40 UTCJul 22, 05:25 UTC2h 45m
2026-07-21 UAL1959 ANC → DEN Jul 21, 01:15 UTCJul 21, 06:05 UTC4h 50m
2026-07-21 UAL1959 ANC → DEN Jul 21, 01:22 UTCJul 21, 06:03 UTC4h 41m
2026-07-20 UAL280 DEN → ANC Jul 20, 18:00 UTCJul 20, 23:20 UTC5h 20m
2026-07-20 UAL2307 DEN → LIH Jul 20, 12:20 UTCJul 20, 15:45 UTC3h 25m
2026-07-20 UAL1214 DEN → EWR Jul 20, 06:15 UTCJul 20, 09:15 UTC3h 0m
2026-07-20 UAL2436 DEN → MSY Jul 20, 02:10 UTCJul 20, 04:15 UTC2h 5m
2026-07-19 UAL1955 IAD → PHX Jul 19, 22:55 UTCJul 20, 00:25 UTC1h 30m
2026-07-19 UAL1840 EWR → ORD Jul 19, 20:15 UTCJul 19, 21:15 UTC1h 0m
2026-07-19 UAL784 - Jul 19, 14:30 UTCJul 19, 17:35 UTC3h 5m
2026-07-19 UAL784 MEX → DEN Jul 19, 14:39 UTCJul 19, 17:29 UTC2h 50m
2026-07-19 UAL1566 IAD → MEX Jul 19, 02:54 UTCJul 19, 06:39 UTC3h 45m
2026-07-19 UAL1566 IAD → MEX Jul 19, 02:50 UTCJul 19, 06:40 UTC3h 50m
2026-07-18 UAL1329 MSY → ORD Jul 18, 23:05 UTCJul 18, 23:35 UTC30m
2026-07-18 UAL1329 MSY → ORD Jul 18, 22:30 UTCJul 18, 23:52 UTC1h 22m
2026-07-18 UAL1329 MSY → ORD Jul 18, 16:30 UTCJul 18, 19:55 UTC3h 25m
2026-07-18 UAL1529 - Jul 18, 11:45 UTCJul 18, 14:25 UTC2h 40m
2026-07-18 UAL1529 - Jul 18, 11:15 UTCJul 18, 11:40 UTC25m
2026-07-17 UAL1827 - Jul 17, 23:10 UTCJul 18, 04:05 UTC4h 56m
2026-07-17 UAL1827 SAN → EWR Jul 17, 22:48 UTCJul 18, 04:01 UTC5h 13m
2026-07-17 UAL2399 - Jul 17, 17:30 UTCJul 17, 20:15 UTC2h 45m
2026-07-17 UAL1957 - Jul 17, 11:50 UTCJul 17, 14:39 UTC2h 50m
2026-07-17 UAL2783 - Jul 17, 00:40 UTCJul 17, 03:45 UTC3h 5m
2026-07-16 UAL2208 - Jul 16, 12:55 UTCJul 16, 22:19 UTC9h 25m
2026-07-14 UAL1629 EWR → SXM Jul 14, 14:52 UTCJul 14, 18:20 UTC3h 28m
2026-07-14 UAL1223 EWR → IAD Jul 14, 14:45 UTCJul 14, 23:45 UTC8h 59m
2026-07-14 UAL798 - Jul 14, 11:15 UTCJul 14, 12:40 UTC1h 25m
2026-07-13 UAL2104 EWR → CLT Jul 13, 23:16 UTCJul 14, 00:41 UTC1h 25m
2026-07-13 UAL2104 - Jul 13, 23:25 UTCJul 14, 00:40 UTC1h 15m
2026-07-13 UAL2415 - Jul 13, 19:50 UTCJul 13, 20:55 UTC1h 5m
2026-07-13 UAL2616 - Jul 13, 16:25 UTCJul 13, 18:05 UTC1h 40m

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 N27256 page for operator, model, and routing details .

Mode-S A2B110 frequently asked

What is Mode-S code A2B110?
A2B110 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N27256.
Where is Mode-S A2B110 registered?
Mode-S code A2B110 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 A2B110 broadcasting right now?
Yes. Mode-S A2B110 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2B110, octal 50530420, decimal 10,662,160.
What flights does A2B110 operate?
Mode-S A2B110 has broadcast 20 distinct callsigns, including UAL1676, UAL359, UAL2153, UAL1675, UAL1298.