Apparatus

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sensors Mode-S transponder

ABFF87

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N872UA · AIRBUS A-319 · operated by UMB BANK NA TRUSTEE

Hex
ABFF87
Octal
52777607
Decimal
11,272,071
Country
US
Tail
N872UA
Type
A319
No current signal · last broadcast Jul 26, 19:20 UTC
Flights observed
502
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 19:20 UTC

Last known position

Most recent position reported by Mode-S ABFF87.

Country allocation

The ICAO 24-bit address ABFF87 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
UAL697 - 6 2026-07-08
UAL1240 United Airlines 6 2026-07-21
UAL822 - 5 2026-07-11
UAL652 United Airlines 5 2026-05-24
UAL2468 - 5 2026-07-16
UAL1920 United Airlines 5 2026-05-05
UAL1178 - 5 2026-06-28
UAL732 - 4 2026-06-13
UAL454 - 4 2026-07-04
UAL412 - 4 2026-07-11
UAL2784 United Airlines 4 2026-07-23
UAL2690 United Airlines 4 2026-07-24
UAL2496 - 4 2026-06-28
UAL2274 United Airlines 4 2026-04-19
UAL2266 United Airlines 4 2026-07-10
UAL2218 United Airlines 4 2026-06-08
UAL2131 United Airlines 4 2026-04-20
UAL1612 - 4 2026-06-19
UAL1439 United Airlines 4 2026-07-17
UAL1380 United Airlines 4 2026-05-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL2079 SFO → BOS Jul 26, 14:55 UTCJul 26, 19:20 UTC4h 25m
2026-07-26 UAL1982 ORD → LGA Jul 26, 11:45 UTCJul 26, 13:35 UTC1h 50m
2026-07-26 UAL549 BOS → ORD Jul 26, 00:00 UTCJul 26, 01:15 UTC1h 15m
2026-07-25 UAL2128 SLC → SFO Jul 25, 18:05 UTCJul 25, 22:10 UTC4h 5m
2026-07-25 UAL340 SFO → DEN Jul 25, 12:50 UTCJul 25, 15:30 UTC2h 40m
2026-07-25 UAL1287 SFO → BOS Jul 25, 01:00 UTCJul 25, 02:45 UTC1h 45m
2026-07-24 UAL555 EUG → SFO Jul 24, 21:10 UTCJul 24, 23:45 UTC2h 35m
2026-07-24 UAL555 EUG → SFO Jul 24, 21:16 UTCJul 24, 23:45 UTC2h 29m
2026-07-24 UAL1307 EWR → BUF Jul 24, 17:47 UTCJul 24, 19:50 UTC2h 3m
2026-07-24 UAL1307 EWR → BUF Jul 24, 17:50 UTCJul 24, 19:55 UTC2h 5m
2026-07-24 UAL2690 LAS → IAH Jul 24, 13:20 UTCJul 24, 14:55 UTC1h 35m
2026-07-23 UAL2784 GUM → SFO Jul 23, 23:31 UTCJul 24, 00:15 UTC44m
2026-07-23 UAL2784 GUM → SFO Jul 23, 23:20 UTCJul 23, 23:45 UTC25m
2026-07-23 UAL364 BDL → DEN Jul 23, 20:05 UTCJul 23, 21:40 UTC1h 35m
2026-07-23 UAL364 BDL → DEN Jul 23, 19:43 UTCJul 23, 21:26 UTC1h 43m
2026-07-23 UAL1287 SFO → BOS Jul 23, 01:55 UTCJul 23, 03:45 UTC1h 50m
2026-07-22 UAL1261 EWR → IAH Jul 22, 19:15 UTCJul 22, 22:35 UTC3h 20m
2026-07-22 UAL591 SEA → EWR Jul 22, 14:46 UTCJul 22, 18:04 UTC3h 18m
2026-07-22 UAL591 SEA → EWR Jul 22, 14:40 UTCJul 22, 18:05 UTC3h 25m
2026-07-22 UAL2053 SFO → PDX Jul 22, 11:35 UTCJul 22, 13:25 UTC1h 50m
2026-07-22 UAL1635 LAX → IAD Jul 22, 03:00 UTCJul 22, 04:40 UTC1h 40m
2026-07-21 UAL1240 SAT → EWR Jul 21, 22:55 UTCJul 22, 01:35 UTC2h 40m
2026-07-21 UAL1240 SAT → EWR Jul 21, 22:45 UTCJul 22, 01:25 UTC2h 40m
2026-07-21 UAL1388 - Jul 21, 20:00 UTCJul 21, 20:45 UTC45m
2026-07-21 UAL1388 IAH → DFW Jul 21, 20:06 UTCJul 21, 20:56 UTC50m
2026-07-21 UAL2190 - Jul 21, 15:30 UTCJul 21, 18:10 UTC2h 40m
2026-07-21 UAL482 ORD → DCA Jul 21, 12:45 UTCJul 21, 14:20 UTC1h 35m
2026-07-21 UAL2770 MSY → ORD Jul 21, 04:50 UTCJul 21, 04:55 UTC5m
2026-07-21 UAL2770 MSY → ORD Jul 21, 03:30 UTCJul 21, 04:55 UTC1h 25m
2026-07-21 UAL2770 MSY → ORD Jul 21, 03:20 UTCJul 21, 04:33 UTC1h 13m
2026-07-21 UAL1634 - Jul 21, 01:10 UTCJul 21, 02:10 UTC1h 0m
2026-07-21 UAL1634 ORD → MCI Jul 21, 00:48 UTCJul 21, 02:06 UTC1h 18m
2026-07-21 UAL1634 ORD → ORD Jul 21, 00:25 UTCJul 21, 00:45 UTC20m
2026-07-20 UAL2738 - Jul 20, 21:35 UTCJul 20, 22:45 UTC1h 10m
2026-07-20 UAL2765 - Jul 20, 18:30 UTCJul 20, 19:35 UTC1h 5m
2026-07-20 UAL705 - Jul 20, 15:15 UTCJul 20, 16:25 UTC1h 10m
2026-07-20 UAL2753 - Jul 20, 12:40 UTCJul 20, 13:45 UTC1h 5m
2026-07-20 UAL785 ATL → ORD Jul 20, 01:20 UTCJul 20, 02:55 UTC1h 35m
2026-07-19 UAL1991 EWR → SFO Jul 19, 21:35 UTCJul 19, 23:25 UTC1h 50m
2026-07-19 UAL1900 SEA → EWR Jul 19, 15:00 UTCJul 19, 19:55 UTC4h 55m
2026-07-19 UAL1796 - Jul 19, 03:15 UTCJul 19, 08:35 UTC5h 20m
2026-07-18 UAL2359 PDX → EWR Jul 18, 20:45 UTCJul 19, 01:45 UTC5h 0m
2026-07-18 UAL1613 EWR → FLL Jul 18, 11:05 UTCJul 18, 16:40 UTC5h 35m
2026-07-18 UAL1711 AUS → EWR Jul 18, 00:39 UTCJul 18, 04:03 UTC3h 24m
2026-07-18 UAL1711 AUS → EWR Jul 18, 00:50 UTCJul 18, 04:10 UTC3h 21m
2026-07-17 UAL2289 PDX → SFO Jul 17, 19:30 UTCJul 17, 23:30 UTC4h 0m
2026-07-17 UAL2172 IAH → PHL Jul 17, 15:20 UTCJul 17, 17:50 UTC2h 30m
2026-07-17 UAL1309 EWR → MSY Jul 17, 11:19 UTCJul 17, 13:43 UTC2h 24m
2026-07-17 UAL1309 EWR → MSY Jul 17, 11:15 UTCJul 17, 13:45 UTC2h 30m
2026-07-17 UAL1439 EWR → SFO Jul 17, 03:30 UTCJul 17, 06:25 UTC2h 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 N872UA page for operator, model, and routing details .

Mode-S ABFF87 frequently asked

What is Mode-S code ABFF87?
ABFF87 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N872UA.
Where is Mode-S ABFF87 registered?
Mode-S code ABFF87 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 ABFF87 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 19:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ABFF87, octal 52777607, decimal 11,272,071.
What flights does ABFF87 operate?
Mode-S ABFF87 has broadcast 20 distinct callsigns, including UAL697, UAL1240, UAL822, UAL652, UAL2468.