Apparatus

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sensors Mode-S transponder

A7BB53

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N598CB · BOEING 737-700

Hex
A7BB53
Octal
51735523
Decimal
10,992,467
Country
US
Tail
N598CB
Type
B737
No current signal · last broadcast 1h ago
Flights observed
104
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A7BB53.

Country allocation

The ICAO 24-bit address A7BB53 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
ETH3414 - 11 2026-07-11
ETH3415 - 9 2026-07-12
ETH3694 - 8 2026-07-07
ETH3631 - 7 2026-07-09
ETH3917 - 6 2026-05-27
ETH3644 - 6 2026-07-13
ETH3695 - 5 2026-06-23
ETH3692 - 5 2026-06-13
ETH3645 - 5 2026-07-13
ETH3611 - 5 2026-07-09
ETH3610 - 5 2026-06-29
ETH3916 - 4 2026-05-11
ETH3632 Ethiopian Airlines 4 2026-06-07
ETH3612 Ethiopian Airlines 3 2026-05-25
ETH3603 - 3 2026-07-08
ETH3923 Ethiopian Airlines 2 2026-07-07
ETH3693 - 2 2026-06-13
ETH3602 - 2 2026-07-07
ETH3433 Ethiopian Airlines 2 2026-06-15
ETH3432 - 2 2026-06-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ETH3453 - Jul 14, 04:35 UTCJul 14, 04:45 UTC10m
2026-07-14 ETH3452 - Jul 14, 02:35 UTCJul 14, 03:10 UTC35m
2026-07-13 ETH3645 - Jul 13, 03:40 UTCJul 14, 02:45 UTC23h 5m
2026-07-13 ETH3644 - Jul 13, 00:50 UTCJul 13, 01:45 UTC55m
2026-07-12 ETH3415 - Jul 12, 01:25 UTCJul 12, 01:50 UTC25m
2026-07-11 ETH3414 - Jul 11, 22:05 UTCJul 11, 22:45 UTC40m
2026-07-09 ETH3611 - Jul 9, 14:20 UTCJul 9, 14:50 UTC30m
2026-07-09 ETH3631 - Jul 9, 10:10 UTCJul 9, 11:10 UTC1h 0m
2026-07-08 ETH3603 - Jul 8, 10:40 UTCJul 8, 11:15 UTC35m
2026-07-07 ETH3602 NSI → SHJ Jul 7, 23:00 UTCJul 8, 09:10 UTC10h 10m
2026-07-07 ETH3923 ADD → LOS Jul 7, 21:15 UTCJul 7, 21:35 UTC20m
2026-07-07 ETH3694 - Jul 7, 05:30 UTCJul 7, 10:10 UTC4h 40m
2026-07-06 ETH3694 - Jul 6, 07:15 UTCJul 7, 06:20 UTC23h 5m
2026-07-06 ETH3644 - Jul 6, 04:05 UTCJul 6, 04:50 UTC45m
2026-07-05 ETH3644 - Jul 5, 05:55 UTCJul 6, 04:45 UTC22h 50m
2026-07-05 ETH3414 - Jul 5, 03:20 UTCJul 5, 03:50 UTC30m
2026-07-02 ETH3415 - Jul 2, 04:55 UTCJul 2, 05:25 UTC30m
2026-07-02 ETH3414 - Jul 2, 02:20 UTCJul 2, 02:50 UTC30m
2026-06-29 ETH3611 - Jun 29, 22:59 UTCJun 29, 23:39 UTC40m
2026-06-29 ETH3610 - Jun 29, 19:49 UTCJun 29, 20:35 UTC45m
2026-06-28 ETH3415 - Jun 28, 08:34 UTCJun 28, 09:10 UTC35m
2026-06-27 ETH3414 - Jun 27, 23:19 UTCJun 28, 06:59 UTC7h 40m
2026-06-23 ETH3695 - Jun 23, 08:50 UTCJun 23, 21:14 UTC12h 25m
2026-06-21 ETH3415 TLV → ADD Jun 21, 08:54 UTCJun 21, 09:20 UTC25m
2026-06-21 ETH3414 ADD → TLV Jun 21, 06:14 UTCJun 21, 06:50 UTC35m
2026-06-20 ETH3414 ADD → TLV Jun 20, 07:14 UTCJun 21, 06:44 UTC23h 30m
2026-06-19 ETH3611 BOM → ADD Jun 19, 17:14 UTCJun 19, 17:49 UTC35m
2026-06-19 ETH3610 ADD → BOM Jun 19, 14:24 UTCJun 19, 15:29 UTC1h 5m
2026-06-17 ETH3603 - Jun 17, 09:00 UTCJun 17, 09:20 UTC20m
2026-06-17 ETH3602 - Jun 17, 05:10 UTCJun 17, 05:40 UTC30m
2026-06-15 ETH3433 BLR → ADD Jun 15, 22:00 UTCJun 15, 22:20 UTC20m
2026-06-15 ETH3432 - Jun 15, 20:04 UTCJun 15, 20:25 UTC20m
2026-06-13 ETH3693 - Jun 13, 13:35 UTCJun 13, 13:55 UTC20m
2026-06-13 ETH3692 - Jun 13, 10:55 UTCJun 13, 11:15 UTC20m
2026-06-10 ETH3922 - Jun 10, 23:40 UTCJun 11, 00:05 UTC25m
2026-06-10 ETH3923 ADD → LOS Jun 10, 21:55 UTCJun 10, 22:10 UTC15m
2026-06-08 ETH3415 TLV → ADD Jun 8, 08:30 UTCJun 8, 09:00 UTC30m
2026-06-08 ETH3414 ADD → TLV Jun 8, 06:00 UTCJun 8, 06:25 UTC25m
2026-06-07 ETH3632 ADD → SHJ Jun 7, 01:30 UTCJun 7, 02:04 UTC35m
2026-06-06 ETH3631 ADD → BOM Jun 6, 22:50 UTCJun 6, 23:44 UTC55m
2026-06-05 ETH3645 - Jun 5, 21:50 UTCJun 5, 22:20 UTC30m
2026-06-04 ETH3645 - Jun 4, 23:40 UTCJun 5, 22:20 UTC22h 40m
2026-06-03 ETH3433 BLR → ADD Jun 3, 22:15 UTCJun 3, 22:30 UTC15m
2026-06-03 ETH3432 - Jun 3, 20:20 UTCJun 3, 20:45 UTC25m
2026-06-02 ETH3645 - Jun 2, 13:00 UTCJun 2, 13:35 UTC35m
2026-06-01 ETH3644 ADD → AMD Jun 1, 23:20 UTCJun 2, 10:15 UTC10h 55m
2026-06-01 ETH3645 - Jun 1, 04:55 UTCJun 1, 21:50 UTC16h 55m
2026-06-01 ETH3644 ADD → AMD Jun 1, 02:30 UTCJun 1, 03:00 UTC30m
2026-05-30 ETH3694 - May 30, 20:25 UTCMay 31, 00:55 UTC4h 30m
2026-05-30 ETH3694 - May 30, 01:50 UTCMay 31, 00:45 UTC22h 55m

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 N598CB page for operator, model, and routing details .

Mode-S A7BB53 frequently asked

What is Mode-S code A7BB53?
A7BB53 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N598CB.
Where is Mode-S A7BB53 registered?
Mode-S code A7BB53 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 A7BB53 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A7BB53, octal 51735523, decimal 10,992,467.
What flights does A7BB53 operate?
Mode-S A7BB53 has broadcast 20 distinct callsigns, including ETH3414, ETH3415, ETH3694, ETH3631, ETH3917.