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
- Flights observed
- 55
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 41m ago
Last known position
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 |
|---|---|---|---|
| ETH3917 | - | 6 | 2026-05-27 |
| ETH3631 | Ethiopian Airlines | 5 | 2026-05-29 |
| ETH3916 | - | 4 | 2026-05-11 |
| ETH3695 | - | 4 | 2026-05-17 |
| ETH3694 | - | 4 | 2026-05-24 |
| ETH3692 | - | 4 | 2026-05-19 |
| ETH3632 | Ethiopian Airlines | 4 | 2026-05-30 |
| ETH3415 | Ethiopian Airlines | 4 | 2026-05-10 |
| ETH3414 | Ethiopian Airlines | 4 | 2026-05-09 |
| ETH3612 | Ethiopian Airlines | 3 | 2026-05-25 |
| ETH3610 | Ethiopian Airlines | 3 | 2026-05-25 |
| ETH3611 | Ethiopian Airlines | 2 | 2026-05-26 |
| ETH3723 | Ethiopian Airlines | 1 | 2026-05-22 |
| ETH3693 | - | 1 | 2026-05-06 |
| ETH3665 | - | 1 | 2026-04-18 |
| ETH3664 | - | 1 | 2026-04-18 |
| ETH3644 | Ethiopian Airlines | 1 | 2026-05-29 |
| ETH3623 | Ethiopian Airlines | 1 | 2026-04-15 |
| ETH3613 | Ethiopian Airlines | 1 | 2026-04-14 |
| ETH3603 | - | 1 | 2026-04-14 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-30 | ETH3632 | ADD → SHJ | May 30, 01:50 UTC | May 30, 02:20 UTC | 30m |
| 2026-05-29 | ETH3631 | ADD → BOM | May 29, 11:25 UTC | May 29, 23:45 UTC | 12h 20m |
| 2026-05-29 | ETH3644 | ADD → AMD | May 29, 08:55 UTC | May 29, 09:50 UTC | 55m |
| 2026-05-27 | ETH3917 | - | May 27, 02:49 UTC | May 27, 09:40 UTC | 6h 50m |
| 2026-05-26 | ETH3611 | BOM → ADD | May 26, 05:40 UTC | May 26, 06:10 UTC | 30m |
| 2026-05-25 | ETH3610 | ADD → BOM | May 25, 23:10 UTC | May 26, 02:00 UTC | 2h 50m |
| 2026-05-25 | ETH3612 | ADD → DXB | May 25, 21:19 UTC | May 25, 21:45 UTC | 25m |
| 2026-05-24 | ETH3612 | ADD → DXB | May 24, 23:10 UTC | May 25, 21:45 UTC | 22h 35m |
| 2026-05-24 | ETH3694 | - | May 24, 09:00 UTC | May 24, 23:30 UTC | 14h 30m |
| 2026-05-24 | ETH3694 | - | May 24, 03:00 UTC | May 24, 23:30 UTC | 20h 30m |
| 2026-05-22 | ETH3723 | BRU → ADD | May 22, 06:45 UTC | May 22, 07:05 UTC | 20m |
| 2026-05-21 | ETH3611 | BOM → ADD | May 21, 18:45 UTC | May 22, 05:05 UTC | 10h 20m |
| 2026-05-21 | ETH3610 | ADD → BOM | May 21, 03:45 UTC | May 21, 17:10 UTC | 13h 25m |
| 2026-05-20 | ETH3631 | ADD → BOM | May 20, 13:55 UTC | May 21, 01:35 UTC | 11h 40m |
| 2026-05-19 | ETH3610 | ADD → BOM | May 19, 23:20 UTC | May 20, 12:05 UTC | 12h 46m |
| 2026-05-19 | ETH3692 | - | May 19, 19:15 UTC | May 19, 19:55 UTC | 40m |
| 2026-05-17 | ETH3695 | - | May 17, 21:45 UTC | May 18, 13:40 UTC | 15h 55m |
| 2026-05-17 | ETH3694 | - | May 17, 18:01 UTC | May 18, 13:40 UTC | 19h 40m |
| 2026-05-17 | ETH3694 | - | May 17, 07:20 UTC | May 17, 22:25 UTC | 15h 5m |
| 2026-05-17 | ETH3631 | ADD → BOM | May 17, 04:15 UTC | May 17, 05:10 UTC | 55m |
| 2026-05-13 | ETH3917 | - | May 13, 04:10 UTC | May 13, 10:10 UTC | 6h 0m |
| 2026-05-11 | ETH3916 | - | May 11, 06:55 UTC | May 11, 22:10 UTC | 15h 15m |
| 2026-05-11 | ETH3917 | - | May 11, 00:49 UTC | May 11, 22:10 UTC | 21h 21m |
| 2026-05-11 | ETH3917 | - | May 11, 00:40 UTC | May 11, 22:10 UTC | 21h 31m |
| 2026-05-10 | ETH3415 | TLV → ADD | May 10, 08:54 UTC | May 11, 07:05 UTC | 22h 10m |
| 2026-05-09 | ETH3414 | ADD → TLV | May 9, 17:30 UTC | May 10, 07:04 UTC | 13h 35m |
| 2026-05-07 | ETH3415 | TLV → ADD | May 7, 05:55 UTC | May 7, 06:20 UTC | 25m |
| 2026-05-06 | ETH3693 | - | May 6, 17:25 UTC | May 7, 04:10 UTC | 10h 44m |
| 2026-05-06 | ETH3692 | - | May 6, 14:30 UTC | May 6, 15:05 UTC | 35m |
| 2026-05-05 | ETH3692 | - | May 5, 20:05 UTC | May 6, 15:05 UTC | 19h 0m |
| 2026-05-03 | ETH3632 | ADD → SHJ | May 3, 21:14 UTC | May 4, 11:30 UTC | 14h 15m |
| 2026-05-03 | ETH3631 | ADD → BOM | May 3, 18:45 UTC | May 3, 19:34 UTC | 50m |
| 2026-05-02 | ETH3917 | - | May 2, 13:45 UTC | May 2, 14:20 UTC | 35m |
| 2026-04-30 | ETH3632 | ADD → SHJ | Apr 30, 13:15 UTC | May 1, 04:10 UTC | 14h 55m |
| 2026-04-30 | ETH3631 | ADD → BOM | Apr 30, 10:50 UTC | Apr 30, 11:45 UTC | 55m |
| 2026-04-28 | ETH3916 | - | Apr 28, 03:00 UTC | Apr 28, 09:15 UTC | 6h 15m |
| 2026-04-27 | ETH3916 | - | Apr 27, 13:05 UTC | Apr 28, 09:15 UTC | 20h 10m |
| 2026-04-27 | ETH3692 | - | Apr 27, 10:15 UTC | Apr 27, 10:45 UTC | 30m |
| 2026-04-26 | ETH3415 | TLV → ADD | Apr 26, 08:40 UTC | Apr 26, 09:10 UTC | 30m |
| 2026-04-26 | ETH3414 | ADD → TLV | Apr 26, 06:05 UTC | Apr 26, 06:35 UTC | 30m |
| 2026-04-24 | ETH3695 | - | Apr 24, 05:40 UTC | Apr 24, 20:55 UTC | 15h 15m |
| 2026-04-24 | ETH3695 | - | Apr 24, 01:30 UTC | Apr 24, 20:55 UTC | 19h 25m |
| 2026-04-23 | ETH3695 | - | Apr 23, 08:05 UTC | Apr 24, 06:20 UTC | 22h 15m |
| 2026-04-23 | ETH3414 | ADD → TLV | Apr 23, 05:25 UTC | Apr 23, 05:55 UTC | 30m |
| 2026-04-21 | ETH3916 | - | Apr 21, 02:25 UTC | Apr 21, 18:20 UTC | 15h 55m |
| 2026-04-20 | ETH3917 | - | Apr 20, 20:55 UTC | Apr 21, 18:20 UTC | 21h 25m |
| 2026-04-19 | ETH3415 | TLV → ADD | Apr 19, 08:20 UTC | Apr 19, 08:50 UTC | 30m |
| 2026-04-19 | ETH3414 | ADD → TLV | Apr 19, 06:10 UTC | Apr 19, 06:35 UTC | 25m |
| 2026-04-18 | ETH3665 | - | Apr 18, 05:50 UTC | Apr 18, 06:15 UTC | 25m |
| 2026-04-18 | ETH3664 | - | Apr 18, 03:25 UTC | Apr 18, 03:45 UTC | 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 N598CB page for operator, model, and routing details .