Apparatus

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sensors Mode-S transponder

A2B134

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N27267 · BOEING 737 MAX 8 · operated by UNITED AIRLINES INC

Hex
A2B134
Octal
50530464
Decimal
10,662,196
Country
US
Tail
N27267
Type
B38M
Broadcasting now · callsign UAL2384 · 32,000 ft
Flights observed
448
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:00 UTC

Current position

A2B134 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A2B134 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
UAL436 United Airlines 5 2026-05-12
UAL1322 United Airlines 5 2026-04-28
UAL1272 United Airlines 5 2026-06-02
UAL1271 United Airlines 5 2026-06-01
UAL346 United Airlines 4 2026-06-20
UAL2350 - 4 2026-06-16
UAL2153 - 4 2026-07-16
UAL1955 United Airlines 4 2026-07-21
UAL1901 - 4 2026-07-12
UAL1847 United Airlines 4 2026-04-15
UAL1749 - 4 2026-07-06
UAL1529 - 4 2026-06-28
UAL1205 - 4 2026-07-07
UAL834 United Airlines 3 2026-07-22
UAL795 United Airlines 3 2026-07-25
UAL702 United Airlines 3 2026-05-20
UAL477 United Airlines 3 2026-07-23
UAL269 United Airlines 3 2026-05-25
UAL2677 - 3 2026-06-19
UAL2651 United Airlines 3 2026-04-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL775 IAD → EWR Jul 26, 15:20 UTCJul 26, 20:00 UTC4h 40m
2026-07-26 UAL2220 ORD → MIA Jul 26, 12:00 UTCJul 26, 12:40 UTC40m
2026-07-25 UAL2623 SFO → OGG Jul 25, 21:30 UTCJul 25, 22:10 UTC40m
2026-07-25 UAL795 ORD → EWR Jul 25, 14:50 UTCJul 25, 19:50 UTC5h 0m
2026-07-25 UAL795 ORD → EWR Jul 25, 14:45 UTCJul 25, 19:44 UTC4h 59m
2026-07-25 UAL1965 LGA → IAH Jul 25, 07:35 UTCJul 25, 12:10 UTC4h 35m
2026-07-25 UAL1965 LGA → IAH Jul 25, 07:30 UTCJul 25, 12:12 UTC4h 42m
2026-07-25 UAL1299 SFO → DEN Jul 25, 04:50 UTCJul 25, 05:35 UTC45m
2026-07-25 UAL1299 SFO → DEN Jul 25, 01:10 UTCJul 25, 01:25 UTC15m
2026-07-24 UAL1298 LAS → SFO Jul 24, 18:15 UTCJul 24, 23:20 UTC5h 5m
2026-07-24 UAL611 CHS → EWR Jul 24, 11:25 UTCJul 24, 16:15 UTC4h 50m
2026-07-24 UAL611 CHS → EWR Jul 24, 11:11 UTCJul 24, 16:11 UTC5h 0m
2026-07-24 UAL649K SFO → TPA Jul 24, 05:05 UTCJul 24, 10:00 UTC4h 55m
2026-07-23 UAL477 BOS → SFO Jul 23, 22:55 UTCJul 24, 03:05 UTC4h 10m
2026-07-23 UAL840 MEL → LAX Jul 23, 15:00 UTCJul 23, 21:35 UTC6h 35m
2026-07-23 UAL840 MEL → LAX Jul 23, 14:41 UTCJul 23, 21:28 UTC6h 47m
2026-07-23 UAL723 - Jul 23, 10:15 UTCJul 23, 12:25 UTC2h 10m
2026-07-23 UAL723 PWM → ORD Jul 23, 10:18 UTCJul 23, 12:18 UTC2h 0m
2026-07-23 UAL1401 AUS → SFO Jul 23, 00:17 UTCJul 23, 01:52 UTC1h 35m
2026-07-23 UAL1401 AUS → SFO Jul 23, 00:05 UTCJul 23, 01:50 UTC1h 45m
2026-07-22 UAL224 ORD → EWR Jul 22, 15:10 UTCJul 22, 21:35 UTC6h 25m
2026-07-22 UAL834 SFO → PIT Jul 22, 08:28 UTCJul 22, 13:07 UTC4h 39m
2026-07-22 UAL834 SFO → PIT Jul 22, 02:10 UTCJul 22, 13:20 UTC11h 10m
2026-07-21 UAL1955 IAD → PHX Jul 21, 22:40 UTCJul 22, 00:10 UTC1h 30m
2026-07-21 UAL1840 EWR → ORD Jul 21, 20:05 UTCJul 21, 21:00 UTC55m
2026-07-21 UAL784 SBA → SFO Jul 21, 14:25 UTCJul 21, 17:25 UTC3h 0m
2026-07-20 UAL1566 IAD → MEX Jul 20, 21:40 UTCJul 21, 01:35 UTC3h 54m
2026-07-20 UAL2607 - Jul 20, 19:25 UTCJul 20, 20:05 UTC40m
2026-07-20 UAL2066 ORD → PHL Jul 20, 17:20 UTCJul 20, 17:50 UTC30m
2026-07-20 UAL445 - Jul 20, 15:15 UTCJul 20, 16:00 UTC45m
2026-07-19 UAL3889 - Jul 19, 04:45 UTCJul 19, 05:35 UTC50m
2026-07-19 UAL3889 ORD → CLE Jul 19, 04:58 UTCJul 19, 05:46 UTC48m
2026-07-18 UAL1784 LAS → ORD Jul 18, 20:45 UTCJul 19, 00:55 UTC4h 10m
2026-07-18 UAL679 - Jul 18, 02:40 UTCJul 18, 03:20 UTC41m
2026-07-17 UAL387 - Jul 17, 22:15 UTCJul 18, 00:50 UTC2h 35m
2026-07-17 UAL2318 - Jul 17, 18:10 UTCJul 17, 20:20 UTC2h 10m
2026-07-17 UAL2318 BWI → LAX Jul 17, 18:07 UTCJul 17, 20:18 UTC2h 11m
2026-07-17 UAL776 - Jul 17, 11:55 UTCJul 17, 15:55 UTC4h 0m
2026-07-16 UAL717 - Jul 16, 18:25 UTCJul 16, 22:35 UTC4h 10m
2026-07-16 UAL2153 - Jul 16, 11:20 UTCJul 16, 15:45 UTC4h 25m
2026-07-15 UAL2476 DEN → CLE Jul 15, 20:15 UTCJul 15, 22:40 UTC2h 25m
2026-07-15 UAL1327 ATL → DEN Jul 15, 15:28 UTCJul 15, 17:51 UTC2h 23m
2026-07-15 UAL1327 ATL → DEN Jul 15, 15:20 UTCJul 15, 17:55 UTC2h 35m
2026-07-15 UAL1287 EWR → ATL Jul 15, 01:30 UTCJul 15, 03:10 UTC1h 40m
2026-07-15 UAL1287 EWR → ATL Jul 15, 00:58 UTCJul 15, 03:07 UTC2h 9m
2026-07-14 UAL1538 EWR → EWR Jul 14, 13:20 UTCJul 14, 22:50 UTC9h 29m
2026-07-14 UAL406 LAS → EWR Jul 14, 07:15 UTCJul 14, 11:45 UTC4h 30m
2026-07-14 UAL8101 - Jul 14, 00:15 UTCJul 14, 04:30 UTC4h 15m
2026-07-13 UAL1784 LAS → EWR Jul 13, 17:25 UTCJul 13, 22:00 UTC4h 35m
2026-07-13 UAL1139 EWR → LAS Jul 13, 10:49 UTCJul 13, 15:03 UTC4h 14m

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 N27267 page for operator, model, and routing details .

Mode-S A2B134 frequently asked

What is Mode-S code A2B134?
A2B134 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N27267.
Where is Mode-S A2B134 registered?
Mode-S code A2B134 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 A2B134 broadcasting right now?
Yes. Mode-S A2B134 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2B134, octal 50530464, decimal 10,662,196.
What flights does A2B134 operate?
Mode-S A2B134 has broadcast 20 distinct callsigns, including UAL436, UAL1322, UAL1272, UAL1271, UAL346.