Socketta: Ping Test & LAN Scan

Socketta is a Wi-Fi channel analyzer, ping test, traceroute and LAN scanner in one toolbox that you enter through the symptom. It shows which channels around you are crowded, measures latency, packet loss and jitter with real ICMP echo requests, traces the route to a host, and runs a LAN scan that lists the devices on your network.

"Slow, but only in the evening."
Look at channels. A spectrum view for 2.4, 5 and 6 GHz places every access point around you by signal strength and channel width, so you can see how many overlap yours, and it suggests a channel. Congestion is reported on a five-step scale, not as a percentage, because a phone cannot measure how much airtime a band is using.

"Wi-Fi drops out for about a minute sometimes."
Look at the band. Channels in the radar-avoidance range (DFS) go quiet for a minute or more when radar is detected. That is the specification working, not a fault. The scan labels each access point with its band group and flags the ones that can drop out this way.

"Video is fine but the game disconnects."
Look at latency. It serves as a game ping test and a ping jitter test. It calls the system ping binary for genuine ICMP, without root. You get the average, packet loss and jitter as a standard deviation, and the round-trip time of every reply is listed. Thresholds are 5% loss, 30 ms jitter and 100 ms average. Games stall when the delay swings as well as when it is high, so the app shows both side by side on every result.

"Something is slow and I cannot tell where."
Look at traceroute. Up to 30 hops, walked by raising TTL from 1, again without root. It tells you whether the problem is inside the house or past your provider.

"I think there are two routers stacked up."
Double NAT check. It looks for a consumer router sitting behind a provider gateway and reports the result as likely, possible or no sign, never as certain. When one more private or carrier-grade NAT address (100.64.0.0/10) shows up beyond your router, it says double NAT is possible and names carrier-grade NAT as the other explanation. The route list marks those shared addresses in a separate color.

"I want to know what is actually connected."
LAN scan and device list. ICMP plus 17 TCP ports. The reverse-DNS hostname, when there is one, is shown in each device's details, and the open ports are used to guess what each device is, marked either likely or candidate. The scan range is limited mechanically to the subnet you are currently attached to.

Walking a site: in the Wi-Fi tab, name a spot, record it and walk to the next one. The CSV export (Pro) names which spots are weak. Survey points are held only while the app is running.

A MAC vendor table of 58,601 prefixes covering 33,983 company names is stored on the device. No MAC address is ever sent to a server for lookup. Be aware that from Android 10 onward the OS hides the ARP table, so in practice the vendor column is often blank.

From Android 9 the OS caps active scans at four every two minutes. The app shows how many remain and how many seconds until the next one is allowed.

All free
Everything above except the CSV export.

Pro, a single one-time purchase
CSV export of the Wi-Fi list (with your survey points) and the device list. There is no subscription.

Please note
Channel advice is written around Japanese radio rules (W52, W53, W56). Outside Japan, access points on 5.8 GHz channels (149 and above) and on 6 GHz above 6425 MHz are marked as not permitted in Japan, and the suggested channel is picked from the channels allowed in Japan.
Not included: mDNS discovery, speed testing, saved measurements or history, before-and-after comparison, PDF reports, notifications, widgets, cloud sync. None of these are implemented. Available in English and Japanese.

Recent changes:
Fixed the purchase screen heading overlapping the clock and battery icons. Also fixed the Back button closing the whole app on the purchase and licenses screens; it now closes just that screen. The spot-name field and Record this spot on the Wi-Fi screen are no longer hidden by the keyboard.