UPDATE 10/4 6:47 EDT

I have been going through all the comments. THANKS!!! I did not know about the techniques listed, so they are extremely helpful. Sorry for the slow update. As I mentioned below, I got behind with this yesterday so work cut into my evening.

I ran a port scan. The first syntax, -p, brought no joy. The nmap software itself suggested changing to -Pn. That brought an interesting response:

nmap -Pn 1-9999 <Local IP Addr>

Starting Nmap 7.93 ( https://nmap.org ) at 2024-10-04 11:44 BST

Failed to resolve “1-9999”. Nmap scan report for <Local IP Address> Host is up (0.070s latency). All 1000 scanned ports on 192.168.0.46 are in ignored states. Not shown: 990 filtered tcp ports (no-response), 10 filtered tcp ports (host-unreach) Nmap done: 1 IP address (1 host up) scanned in 6.03 seconds Just to be absolutely sure, I turned off my work computer (the only windows box on my network) and reran the same syntax with the same results.

As I read this, there is definitely something on my network running windows that is not showing up on the DHCP.

UPDATE 10/6

I am working through all these suggestions. I am sorry for the slow responses, but I have my hands full with family weekend. I will post more next tomorrow. But I did do one thing that has me scratching my head and wondering if this may be a wild goose chase.

I ran the nmap again per below with a completely fictional IP address within my normal range. It gave the exact same results:

nmap -A -T4 -p- -Pn <Fictional IP>

Starting Nmap 7.93 ( https://nmap.org ) at 2024-10-05 13:36 BST Nmap scan report for <Fictional IP>

Host is up (0.054s latency).

All 65535 scanned ports on <Fictional IP> are in ignored states.

Not shown: 65525 filtered tcp ports (no-response), 10 filtered tcp ports (host-unreach)

Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .

Nmap done: 1 IP address (1 host up) scanned in 182.18 seconds

  • fmstratEnglish
    21•7 months ago

    Others haven’t suggested this yet, but a single device, like your laptop, even with one connection, can have two IPs.

  • FlaxEnglish
    13•7 months ago

    It’s me. I’m your nextdoor neighbour. Sorry!

  • @SlothMama@lemmy.world
    15•7 months ago

    Get the MAC address from the ARP table, and look up the OIN, should help you determine if it’s virtual or physical, and if physical the type of NIC it’s using.

  • @f4f4f4f4f4f4f4f4@sopuli.xyzEnglish
    0•7 months ago

    nmap’s seeing the 1-9999 as the next argument (expecting an IP address). In -Pn, the n is a placeholder for the port numbers you want to scan, so you want -P1-9999

  • @OfficerBribe@lemm.ee
    2•7 months ago

    Besides the MAC lookup suggestion, have you tried to simply find hostname in local DNS by reverse IP lookup, maybe that would shed some light.

    Not sure if there is anything useful, but in browser just check site source, maybe there is something useful there that could help with identification. Does site have certificate? It might include info that would help with identification. Do the standard browser network trace via dev tools F12, maybe something useful appears there.

    In nmap you can attempt to guess OS, try that. Additionally it might be possible to get hostname as well.

    And have you checked your router to see if this connection is connected to your Wi-Fi AP or Ethernet to narrow things down? If it is not possible to determine this from router, simply connect your main PC to Ethernet, disable AP in router settings and check if IIS site is still up. If it is not, enable AP again, does it come back early or it takes some time?

    Lastly, if it still is a mystery, start powering off devices one by one to find the source. Based on comments it seems you have multiple devices, but I assume it would not take that long?

  • @Seasm0ke@lemmy.world
    63•7 months ago

    Following, I want to know what god awful iot device this is. Refrigerator? Toaster oven? Vibrating dildo? The suspense is killing me

      • WrenEnglish
        16•7 months ago

        Maybe I want my vibrating dildo to take an hour to load and come with spyware

        • @froh42@lemmy.world
          3•7 months ago

          I have a Bluetooth controlled vibrator. Reverse engineered the app (which has a chat function) and it has a blacklist of words (mainly Chinese) you’re not allowed to text using the app.

          I did not check if your horny chat gets copied to Chinese spy agencies, but I suspect that will be done on the server.

        • @DokPsy@lemmy.world
          7•7 months ago

          Hey, I’m not normally one to judge but it seems like a bad idea to call yourself spyware. Either you’re going to blow your cover or it’s just negative self talk.

  • r00ty
    74•7 months ago

    So, as others have saId this is just an unconfigured IIS server, which implies it’s either a windows machine, or a windows based VM, well or someone put the default IIS files on another server, but that’s unlikely.

    When you say “weird” IP I’d wonder what you mean by that.

    I think since it’s probably a windows machine, from another windows machine typing nbtstat -A <ip> should give you the computer name and workgroup or domain they belong to. See if it matches anything you expect on your network.

    If not, maybe it’s time to change your WPA wifi key.

    • @RestrictedAccount@lemmy.worldOP
      4•7 months ago

      Thanks. I ran nbtstat and it came up empty.

      Edit: Also, I am big on wired networks. I mostly save WI-FI for smart and mobile devices. There is a lot of stuff on Ethernet that does not need a password.

      • r00ty
        8•7 months ago

        Hmm. That would mean it’s likely one of the following (well perhaps more options, but these spring to mind)

        • A windows machine that has the network set as a public network, or netbios specifically blocked on LAN.
        • A windows machine that has all the netbios services disabled.
        • Not a windows machine, or a container as others suggested that’s running some kind of IIS install
        • Not a windows machine at all but for some weird reason IIS files and a web server setup.

        I think you suggested in another comment, that it’s not in your DHCP client list but has an IP in your normal range. Which suggests it is setup with a static IP. That is odd.

        Some other people suggested it could be a container that is using a real IP rather than the NAT that docker etc usually use. I do know that you can use real IPs in containers, I’ve done it on my NAS to get a “proper” linux install on top of the NAS lite linux that is provided. But I would have expected that you’d know about that, since it would require someone to actually choose the IP address to use.

        If you have managed switches you could find which port on which switch the MAC address (as found by lookuping up the arp record for the IP using arp -a) is on (provided the switch allows access to the forwarding tables). Of course, if they’re on Wi-Fi it’s only going to lead to the access point they’re connecting to.

      • r00ty
        4•7 months ago

        I don’t even think my current wifi kit has WPA (1) as an option. It’s WPA2 or 3 only I’m pretty sure.

  • @rtxn@lemmy.worldEnglish
    70•7 months ago

    The default home page for Microsoft IIS, the web server built into Windows Server (and probably some desktop builds too).

    • @RestrictedAccount@lemmy.worldOP
      4•7 months ago

      This is interesting. I had to modify it to nmap -A -T4 -p- -Pn <IP>.

      It said the host is up with 0.077 seconds of latency. All 64k ports were scanned with 7 filtered tcp ports (host-unreachable) and the rest (no-response).

      • @deltapi@lemmy.world
        4•7 months ago

        What’s weird about this is that it should be getting a response from IIS like you showed us in the screenshot.

      • TunaCowboy
        1•7 months ago

        You should try running the original command with elevated privileges, sudo nmap ... on linux.

      • @mrbaby@lemmy.world
        3•7 months ago

        77ms of latency is pretty slow. Based off that I’d assume (but not rule out) that it’s not: on the machine you used to run nmap, not on ethernet, probably wifi with a shitty connection

        So, some really dumb, likely irrelevant, questions that might spark an idea:

        • Do you see anything weird connected in the wifi client list? (You said it wasn’t given a dhcp lease, but it would still show as a wireless client even if it were static)

        • Are you running a VPN server or using VPN to bridge any networks?

        • You said you’re running dual WAN, are those configured properly and not leaking random internet shit into your LAN?

        • Do you have anything that might be running some kind of out-of-band management system like DRAC on a dell server?

        • What’s your IoT situation?

        • Do you have an on-site NVR for security cams?

        • Did you find the mac? If so what are the first 3 octets? Even if the vendor can’t be found, there’s always the chance some crazy ubernerd is going to recognize it. (If it’s 00:d0:2c or 44:d9:e7 I got ya covered)

        Again, most of those are probably irrelevant, but throwing the thoughts out there :)

  • @mvirts@lemmy.world
    1•7 months ago

    Maybe try traceroutre or lft (layer 4 traceroutre) to see if something wacky is happening with routing in your lan?

  • @mvirts@lemmy.world
    1•7 months ago

    You’re looking at my worst nightmare 😅

    I would download metasploit and dig up some interesting exploits to try against it.