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sensors Mode-S transponder

AAA621

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N7855A · BOEING 737-700 · operated by SOUTHWEST AIRLINES CO

Hex
AAA621
Octal
52523041
Decimal
11,183,649
Country
US
Tail
N7855A
Type
B737
Broadcasting now · callsign SWA3629 · 32,600 ft
Flights observed
658
Distinct callsigns
20
Country
US
Last broadcast
7h ago

Current position

AAA621 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AAA621 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
SWA2041 Southwest Airlines 8 2026-05-15
SWA2335 - 6 2026-07-07
SWA1758 Southwest Airlines 6 2026-05-11
SWA962 Southwest Airlines 5 2026-04-17
SWA766 Southwest Airlines 5 2026-06-09
SWA3517 Southwest Airlines 5 2026-05-23
SWA2227 Southwest Airlines 5 2026-05-03
SWA2098 - 5 2026-04-16
SWA148 - 5 2026-07-09
SWA937 - 4 2026-06-24
SWA921 - 4 2026-06-25
SWA839 - 4 2026-06-15
SWA3529 Southwest Airlines 4 2026-06-09
SWA3102 Southwest Airlines 4 2026-05-27
SWA2414 Southwest Airlines 4 2026-06-16
SWA2353 Southwest Airlines 4 2026-05-03
SWA2310 Southwest Airlines 4 2026-05-30
SWA225 Southwest Airlines 4 2026-07-08
SWA2051 - 4 2026-07-02
SWA1911 Southwest Airlines 4 2026-05-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SWA3705 - Jul 14, 05:15 UTCJul 14, 06:40 UTC1h 25m
2026-07-14 SWA4884 BUR → SJC Jul 14, 03:25 UTCJul 14, 04:05 UTC40m
2026-07-14 SWA3360 SMF → BUR Jul 14, 01:20 UTCJul 14, 02:20 UTC1h 0m
2026-07-13 SWA4096 DEN → SMF Jul 13, 22:25 UTCJul 14, 00:25 UTC2h 0m
2026-07-13 SWA859 GEG → DEN Jul 13, 19:10 UTCJul 13, 20:55 UTC1h 45m
2026-07-13 SWA3500 - Jul 13, 15:45 UTCJul 13, 17:55 UTC2h 10m
2026-07-13 SWA3506 - Jul 13, 05:20 UTCJul 13, 06:35 UTC1h 15m
2026-07-13 SWA3179 - Jul 13, 03:25 UTCJul 13, 04:15 UTC50m
2026-07-13 SWA4078 - Jul 13, 00:55 UTCJul 13, 01:55 UTC1h 0m
2026-07-13 SWA4078 RNO → LAS Jul 13, 00:50 UTCJul 13, 01:49 UTC59m
2026-07-12 SWA4875 - Jul 12, 23:00 UTCJul 13, 00:01 UTC1h 0m
2026-07-12 SWA1962 PHX → SAN Jul 12, 21:00 UTCJul 12, 22:05 UTC1h 5m
2026-07-12 SWA1962 PHX → SAN Jul 12, 20:58 UTCJul 12, 21:46 UTC48m
2026-07-12 SWA2068 - Jul 12, 17:45 UTCJul 12, 19:45 UTC2h 0m
2026-07-12 SWA2068 - Jul 12, 15:25 UTCJul 12, 16:40 UTC1h 15m
2026-07-12 SWA3609 - Jul 12, 12:55 UTCJul 12, 13:50 UTC55m
2026-07-12 SWA3609 SDF → MDW Jul 12, 12:51 UTCJul 12, 13:45 UTC55m
2026-07-12 SWA671 BNA → SDF Jul 12, 01:50 UTCJul 12, 02:15 UTC25m
2026-07-12 SWA1768 - Jul 12, 00:05 UTCJul 12, 00:35 UTC30m
2026-07-11 SWA1768 - Jul 11, 20:05 UTCJul 11, 22:20 UTC2h 15m
2026-07-11 SWA1972 - Jul 11, 16:45 UTCJul 11, 18:15 UTC1h 30m
2026-07-11 SWA1972 HOU → DEN Jul 11, 16:42 UTCJul 11, 18:37 UTC1h 56m
2026-07-11 SWA1535 - Jul 11, 13:45 UTCJul 11, 15:35 UTC1h 50m
2026-07-11 SWA1535 DEN → HOU Jul 11, 13:40 UTCJul 11, 15:34 UTC1h 54m
2026-07-11 SWA1220 COS → DEN Jul 11, 11:40 UTCJul 11, 12:05 UTC25m
2026-07-11 SWA1220 COS → DEN Jul 11, 11:40 UTCJul 11, 12:06 UTC26m
2026-07-11 SWA4487 LAS → COS Jul 11, 03:05 UTCJul 11, 04:30 UTC1h 25m
2026-07-10 SWA3846 - Jul 10, 23:25 UTCJul 11, 00:15 UTC50m
2026-07-10 SWA3087 - Jul 10, 21:15 UTCJul 10, 22:25 UTC1h 10m
2026-07-10 SWA3087 OAK → SNA Jul 10, 21:15 UTCJul 10, 22:20 UTC1h 5m
2026-07-10 SWA4893 - Jul 10, 19:15 UTCJul 10, 20:10 UTC55m
2026-07-10 SWA1569 - Jul 10, 15:55 UTCJul 10, 16:15 UTC20m
2026-07-10 SWA1569 DEN → LAX Jul 10, 15:50 UTCJul 10, 17:44 UTC1h 54m
2026-07-10 SWA3615 - Jul 10, 12:30 UTCJul 10, 14:35 UTC2h 5m
2026-07-10 SWA3082 OAK → SEA Jul 10, 04:38 UTCJul 10, 06:04 UTC1h 26m
2026-07-10 SWA3082 OAK → SEA Jul 10, 04:40 UTCJul 10, 06:05 UTC1h 25m
2026-07-10 SWA3082 ONT → OAK Jul 10, 02:35 UTCJul 10, 03:30 UTC55m
2026-07-10 SWA480 SMF → ONT Jul 10, 01:00 UTCJul 10, 01:55 UTC55m
2026-07-10 SWA480 SMF → ONT Jul 10, 00:56 UTCJul 10, 01:53 UTC57m
2026-07-09 SWA148 PHX → SMF Jul 9, 22:40 UTCJul 10, 00:15 UTC1h 35m
2026-07-09 SWA148 ABQ → PHX Jul 9, 20:40 UTCJul 9, 21:35 UTC55m
2026-07-09 SWA148 - Jul 9, 18:00 UTCJul 9, 19:30 UTC1h 30m
2026-07-09 SWA148 - Jul 9, 14:55 UTCJul 9, 16:55 UTC2h 0m
2026-07-09 SWA148 - Jul 9, 12:35 UTCJul 9, 13:45 UTC1h 10m
2026-07-09 SWA3897 STL → BWI Jul 9, 01:35 UTCJul 9, 03:15 UTC1h 40m
2026-07-08 SWA4159 - Jul 8, 23:10 UTCJul 9, 00:20 UTC1h 10m
2026-07-08 SWA225 BWI → PWM Jul 8, 20:55 UTCJul 8, 22:05 UTC1h 10m
2026-07-08 SWA225 BWI → PWM Jul 8, 20:54 UTCJul 8, 21:57 UTC1h 3m
2026-07-08 SWA225 BWI → PWM Jul 8, 18:25 UTCJul 8, 19:45 UTC1h 20m
2026-07-08 SWA225 BWI → PWM Jul 8, 16:00 UTCJul 8, 17:20 UTC1h 20m

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 N7855A page for operator, model, and routing details .

Mode-S AAA621 frequently asked

What is Mode-S code AAA621?
AAA621 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N7855A.
Where is Mode-S AAA621 registered?
Mode-S code AAA621 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 AAA621 broadcasting right now?
Yes. Mode-S AAA621 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AAA621, octal 52523041, decimal 11,183,649.
What flights does AAA621 operate?
Mode-S AAA621 has broadcast 20 distinct callsigns, including SWA2041, SWA2335, SWA1758, SWA962, SWA766.