Which Wifi access points support the IEEE 802.11-2016 FTM RTT protocol?

  1. Compulab's Wifi Indoor Location Device (WILD) contains a modified (§) Intel AC-8260 WiFi chip that is FTM RTT enabled and can act as an access point (AP) (on channels 36, 40, 44, or 48).

  2. Google Wifi access points support the IEEE 802.11-2016 FTM RTT protocol and advertize this ability. Google WiFi uses a single Qualcomm IPQ4019 chipset for both 2.4 GHz (no FTM RTT) and 5 GHz.


Some access points respond to the IEEE 802.11-2016 FTM RTT requests, but do not advertize that capability in the beacon frame ()
For example:

  1. ASUS Wireless RT-ACRH13 responds to the IEEE 802.11-2016 FTM RTT requests, but does not advertize that capability in the beacon frame ()
    Note: produces some measurements systematically short by 0.9 meter and sometimes 1.8 meter.
    Note: ASUSTek uses many different WiFi chip sets in its routers, many of which do not support FTM RTT (e.g. ASUS RT-AC66U does not).

  2. ASUS Wireless RT-ACRH17 responds to the IEEE 802.11-2016 FTM RTT requests, but does not advertize that capability in the beacon frame ()
    Note: at times produces measurements systematically short by 10.3 meter — or too large by 5.5 meter.
    Note: while being a newer, more expensive replacement for the RT-ACRH13, the RT-ACRH17 seems to produce somewhat less reliable, “noisier” ranging results.
    Note: ASUSTek uses many different WiFi chip sets in its routers, many of which do not support FTM RTT (e.g. ASUS RT-AC86U does not).

  3. Eero Pro responds to IEEE 802.11-2016 FTM RTT requests, but does not advertize that capability in the beacon frame (). Eero Pro has one radio operating in the lower part of the 5 GHz band and one in the upper part. The first 5GHz radio uses the Qualcomm IPQ4019 chip and the second 5Ghz radio the Qualcomm QCA9886 chip (Not surprisingly then, the offsets and errors of the two channels are different).

  4. Netgear Orbi (RBR20) responds to IEEE 802.11-2016 FTM RTT requests, but does not advertize that capability in the beacon frame (). Netgear Orbi has one radio operating in the lower part of the 5 GHz band and one in the upper part (backhaul only). The first 5GHz radio uses the Qualcomm IPQ4019 chip and the second 5GHz radio uses the Qualcomm QCA9984 chip.


Currently, most installed WiFi access points do not support the IEEE 802.11-2016 FTM RTT protocol at all.

  1. A small fraction (about 3% in Boston's Back Bay) do, but do not advertize this ().
    The MAC addresses of devices observed “in the wild” that do are registered to: Google, eero inc, NETGEAR, Belkin, ASKEY Computer Corp, ASUSTek, TP-LINK Technologies, Ubiquiti, HTC Corporation, Hitron, Ruckus, Open Mesh, Mojo Networks, Synology, Luma Home, CradlePoint, IgniteNet, Xiaomi Communications, OnePlus Technology, and Shenzhen Four Seas Global (in decreasing order of occurrence). Specific models of responding APs are not known (except for hose listed in the previous section).

  2. Support for FTM RTT is mostly in the 5 GHz band. WiFi signals in the 2.4 GHz band “go further” and penetrate building materials better than those at 5 GHz. At the same time the lower bandwidth available in the 2.4 GHz band (max 40 MHz) reduces the accuracy of RTT measurement somewhat. The MAC addresses of some APs observed “in the wild” supporting the 2.4 GHz band are registered to: eero inc, ASKEY Computer Corp, Ubiquiti, HTC Corporation, Synology, and OnePlus Technology. Again, specific model numbers of responding APs are not known.

  3. Even fewer APs support the FTM RTT protocol in both 2.4 GHz and 5 GHz bands. One that does has WiFi chips from ASKEY COMPUTER CORP — make and model unknown.

  4. Many of the APs that support FTM RTT are relatively recent designs, typically part of “mesh” configurations.
    The following are some APs which can be part of a mesh configurations
    (Note: Only particular AP models from these vendors may support IEEE 802.11-2016 FTM RTT — but do not advertize it):

    Google Wifi Dual Band Mesh Router, eero Pro Mesh WiFi System (second generation), Netgear Orbi Tri-Band Mesh System, Linksys Velop Tri-Band Mesh WiFi System, TP-Link Deco M9 PlusWiFi Mesh System, Ubiquiti AmpliFi HD Dual-Band Mesh Wi-Fi System, ASUS Lyra Tri-Band Whole-Home Mesh WiFi System, Zyxel Multy X tri-band mesh, MeshForce M1 WiFi, Tenda Nova MW3, MW5, MW5s, or MW6 Whole Home Mesh WiFi, D-Link COVR Tri-Band Whole Home WiFi Mesh System, etc. (but see ())

    Warning: A seller likely will not accept return of an AP just for not supporting FTM RTT (or not suppporting it properly) — unless the product description explicitly claimed support FTM RTT (IEEE 802.11-2016).


(§) Note: Many WiFi cards can not be used as access points because of regulatory restrictions on their channels. Channels may be marked “disabled,” “passive scan only” or “no IR” (i.e. cannot “initiate radiation”). Generic Intel 8260, Intel 8265, Intel 9260 WiFi cards do “support” FTM RTT, but are not allowed to act as access points (due to “no IR” restriction on channels in the 5GHz band) and so are not useful as FTM RTT responders.

(†) Note: Access points that support the IEEE 802.11-2016 FTM RTT protocol, but do not advertize this capability, are awkward to use because Android API WiFiManager.getScanResults() marks them as non-supporting in the ScanResult, and so the WifiRttManager.startRanging(...) call on the corresponding RangingRequest will fail — without even trying.

(‡) Note: APs that support FTM RTT, but do not advertize this capability, may, in some cases, not support it properly yet, be subject to large measurement errors, frequent outliers, or crashes when asked to respond “too often.”


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