The IP (internet protocol) is a protocol for transmitting data over packets ("datagrams"). It is the primary protocol of the Internet. "IP" may also refer to an IP address, the numerical address assigned to an IP-capable device.

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Windows command that returns external IP

Is there a command by which I can find my external IP of my router or my NAT\DSL Router, etc., eliminating the need to visit whatsmyip.net or similar.
349
votes
4answers
44k views

Why does pinging 192.168.072 (only 2 dots) return a response from 192.168.0.58?

I mistakenly missed the dot off of an IP address and typed in 192.168.072. To my surprise I connected to a machine at 192.168.0.58 If I ping 192.168.072 I get responses from 192.168.0.58. Why is ...
9
votes
5answers
22k views

Is it possible to host a web server from behind a NAT

My PC is behind a NAT router that has a public IP address. If I want to host a website then I believe I need a domain name which I can purchase from some site which would pledge to resolve all DNS ...
11
votes
2answers
7k views

How does the router know which device to send packets to? [duplicate]

my question does not concern how it moves through the internet, but how it moves through the router to a certain device. All devices connected to a router in a home network have the same external IP. ...
61
votes
4answers
44k views

How to make ssh tunnel open to public?

Well, referring back to this question, I am running the command ssh -R 8080:localhost:80 -N root@example.com on a Mac. Yet the port that is being tunneled is not working publicly. I am running such ...
14
votes
2answers
46k views

How do I setup a virtualbox server with a static ip?

I'm trying to get a Virtualbox instance running with a very specific networking setup. Here's what I have right now: I have a laptop running Ubuntu, hosting a Debian Virtualbox. My loptop regularly ...
4
votes
1answer
8k views

Accessing a website via the webservers public IP from a PC within the same LAN

If two machines reside on the same LAN (a PC and a Webserver) why is it necessary to enable ‘NAT loopback’ on the router in order for the PC to access the website hosted on the webserver using the ...
8
votes
2answers
13k views

How to map an IP adress to localhost?

I want to map the IP address 192.168.1.222 to 127.0.0.1 so that if I use 192.168.1.222 in the web browser or ping command I get the response (and that from my 127.0.0.1). Is this possible via ...
4
votes
6answers
13k views

How to get assigned IPs by hostednetwork?

I just started using Microsoft Virtual WiFi or hostednetwork from Command Prompt to share my internet connection through my WiFi adapter and it's good so far! The only issue I face however is that I ...
4
votes
3answers
12k views

Find all past desktop IP addresses

Is there a way to find some type of log file that saves all IP address that were assigned to a desktop? I changed an static IP of a desktop (switched it to DHCP) of mine and i can not recall what the ...
0
votes
1answer
53 views

Updated DNS zone can't be seen from my local network

I have updated a domain name DNS zone on 123-reg.co.uk where I bought the domain name. I have only updated blog A record to different hosting(IP) On my PC home (windows) or another PC in the same ...
104
votes
13answers
50k views

What is the exact use of a MAC address?

I understand that IP addresses are hierarchical, so that routers throughout the internet know which direction to forward a packet. With MAC addresses, there is no hierarchy, and thus packet forwarding ...
71
votes
9answers
9k views

Are IP addresses with and without leading zeroes the same?

I have a security system and the network setting only allows a three-digit IP address. I can't set it to 192.168.2.100, instead I have to use 192.168.002.100. Are these two IP addresses different? Do ...
17
votes
2answers
66k views

How to route only specific subnet (source ip) to a particular interface?

How to route only specific subnet (source ip) to a particular interface? OS: Linux I know I can do easily by destination IP by using something like route add 1.2.3.4/24 dev eth4 but I do not ...
23
votes
8answers
98k views

Find an unknown static IP + subnet mask of device?

I have a device set with a static IP and subnet mask. I do not know the IP or subnet mask. How can I find the devices IP and subnet mask? It is a piece of hardware, not a PC. It will not take an IP ...
31
votes
7answers
43k views

How can I own an IP address?

How can I own an IP address like I do with domains? I have done some research and it seems that you can't buy a single IP, but rather you have to purchase a range of IP addresses. Update : Important ...
14
votes
4answers
12k views

How do I find out which program and process ID accesses a given IP address in Windows?

Is it possible to catch, which program is accessing a specific IP address? I found my computer is flooding and wish to check addresses one by one. May be it is possible to set up some audit for ...
8
votes
3answers
3k views

How do DNS servers work?

I know that a domain name is resolved by a DNS server to an IP address, which is then used to reach the requested server. I'm slightly embarrassed that I don't know some of the details of how this ...
11
votes
8answers
61k views

How to get my external IP address (over NAT) from the Windows command-line? [duplicate]

The Windows "ipconfig" command can only show me the parameters from the Ethernet interfaces from my machine (even with the ipconfig /all argument). It can show detailed information about the interface,...
4
votes
1answer
5k views

What information can my ISP see from my router?

I installed a new router today and saw my IP address change because the new router has a different MAC address and I am just curious on what information my ISP can see from my network. I know they ...
2
votes
1answer
924 views

Using Remote Desktop to connect to different computers behind same IP

I'm trying to connect my computer from home to two computers in my office. The office has a router and I already forward the port for computer A. I can successfully connect to my computer A at my home ...
2
votes
1answer
2k views

IP-to-IP Redirect

How can i redirect an IP to another IP, cause currently i have a program connecting to old IP address, sadly its hardcoded into it and its impossible to change it without violating its EULA, i want to ...
1
vote
2answers
2k views

how can i forward requests to my own IP address to a local IP address in my network (possibly using named)?

My setup I have a linux server running in my basement. I currently have my router looking to that server for DNS lookup, so I can use named to spoof a bunch of domain names to point to my local ...
121
votes
5answers
265k views

How can I list all IPs in the connected network, through Terminal preferably?

Using Ubuntu 10.10, I was wondering if there was a command line command that can list all the IPs of devices connected to the network? I would use this for example, to list all the computers ...
117
votes
7answers
5k views

Why can't I email myself at: MyEmail@74.125.235.55?

I opened cmd and typed ping gmail.com. It shows me: C:\Windows\system32>ping gmail.com Pinging gmail.com [74.125.235.55] with 32 bytes of data: Reply from 74.125.235.55: bytes=32 time=6ms TTL=56 ...
8
votes
7answers
159k views

Windows command to display all IP addresses

I know there is a single line of a command and its arguments that can help display all computer IP addresses (those that are being used) on a LAN, and my computer is also a client, as one of those ...
5
votes
2answers
13k views

Problem with persistent routes and VPN connection in Windows 7

My home PC has a VPN connection to my office. The office network is firewalled, with a secure zone on 192.168.0.* and a DMZ on 10.0.0.* From outside, www.mycompany.com routes to a public IP - say 1....
4
votes
5answers
5k views

Where are addresses from the network 0.0.0.0/8 used in practice?

I read that this pool: Means "these hosts" in "this network" Is used for self-identification Is used for broadcast messages My questions are: Where exactly these addresses can be found? Which ...
4
votes
5answers
4k views

What cross-platform command-line tool allows me to get my external IP address?

How do I get my external IP address from the Windows and Linux command line? On Windows, ipconfig shows an internal network IP address, but it does not show the external one.
8
votes
2answers
42k views

How to get the real IP address of someone using a proxy?

I was researching digital goods and security when I stumbled upon this company. One of the services they provide is "Real IP". They claim to be able to get the real IP address of users even when ...
4
votes
3answers
10k views

How can I map a domain name to an IP address and port?

I want to give a domain name to the IP address and port for an application in Windows 7. For example, test.com should map to 127.0.0.1:59873. Is there anyway that we can do it by using a web server ...
17
votes
5answers
4k views

What is the actual IP address of my computer

I am testing out to see whats my IP address but depending on which website I used , I get different IP address . I am using a router If i use this , My IP address is If i use this , My IP address ...
7
votes
1answer
1k views

* * * in traceroute

If I traceroute to my server via a bunch of different methods, the external ip seems to not work. However the server is online and accessible by this ip. Localhost: michaelxu@michaelxu-server:~$ ...
5
votes
1answer
1k views

What does “network” mean in the /etc/network/interfaces file?

In Linux, to define aliases, we have to modify /etc/network/interfaces.. Something like this: auto eth0:1 iface eth0:1 inet static address 192.168.1.60 netmask 255.255.255.0 network x.x.x.x ...
3
votes
3answers
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How can I copy a print file to a networked printer?

I have an Epson TM-T88V network printer. I can print to it using the printer driver. But I need to copy a "print file" to the printer using the command line, and this causes problems. I cannot use ...
2
votes
7answers
28k views

How to get LAN ip to a variable in a Windows batch file

I'm streaming audio from my Windows 7 laptop to a sound card attached to a router. I have a little batch script to start streaming. REM Kill any instances of vlc taskkill /im vlc.exe "c:\Program ...
2
votes
6answers
42k views

How to view as another country IP address? [duplicate]

I need to view the Google music, but that is restricted in our country. Can I access it using any other fake IP address or how to view that?
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vote
3answers
4k views

Why do I have different IP addresses on different websites?

My wireless router shows the IP address is 113.46.75.*, which some websites like ip138.com, www.ip.cn show as my IP. But other websites, like googling for "what is my ip", www.whatismyip.com, www....
0
votes
4answers
6k views

Know exact location of IP address

I am trying to find locations of some IP addresses. I am using http://www.geobytes.com/IpLocator.htm?GetLocation but it seems not returning exact information. I am from Egypt, and whatever I search ...
2
votes
2answers
8k views

Is 225.225.225.128 a valid subnet mask?

I have been told that we have two devices on a network: 10.40.225.142 and 10.40.225.144 These devices both have Gateway 10.40.225.129 Subnet mask 225.225.225.128 (note 225 is Not a typo) These ...
1
vote
1answer
67 views

If router is off for a few days, do you have an ip address as far as ISP is concerned?

I have an ISP which assigns IP addresses dynamically. If I go out and turn my router off I am always assigned a new one once I turn it back on. Does that mean that... 1) my previous IP goes elsewhere ...
1
vote
2answers
3k views

What happens if 2 devices want the same static IP address?

I don't know much about IP addressing. In my mind, static IP addresses are something that a device requests, asking for a specific address. With that approach, what happens if 2 devices attempt to ...
1
vote
2answers
1k views

DHCP Lease time

I have computer connected to internet directly. But once every hour IP changes and I do not want that for sure. How can I set IP lease time for like a year or so? Thank you
1
vote
0answers
55 views

point multiple ip address to hosting

I have centos server, earlier it had 1 ip [ a.b.c.d ] (external ip , eg., 141.101.114.59). Now, I bought 2 additional ip [b.c.d.e , f.g.h.i] (external ip , e.g, 190.93.244.58 , 130.93.245.8 ). I have ...
1
vote
0answers
688 views

How to redirect a URL to a certain IP, as with /etc/hosts?

Someone on my shared server has messed with some setting such that gethostbyname('www.google.com') (PHP) gives me the IP for his website, rather than Google. I believe this can be done via the /etc/...
1
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1answer
2k views

TCP/UDP ports that cannot be bound (permission error), but don't show up in netstat

When attempting to listen on certain TCP or UDP ports, I get weird error messages regarding permissions (or generic messages, depending on the program used to bind). The message in German is "Der ...
0
votes
2answers
1k views

Discover the public ip of a network without being connected

Let say, I'm next to a network and can see the traffic (with airodump or similar tool) but can not decipher it (because I am not connected on the network). Is it possible to discover the public ip ...
0
votes
2answers
754 views

I can’t ping my router from the outer [closed]

I am trying to remote the server of my company from my home. I enter the router of the company and I get this info: Internet, IPv4 POST LuxFibre LAN1 NG, IP address: 10.244.149.239 But I also ...
0
votes
2answers
320 views

IPv4 and IPv6 from different browsers on same computer

On my laptop, in Chrome, when I Google "What is my IP?", I get an IPv6 returned as my public IP address. On the same laptop, in Firefox, I Google the same thing, and get an IPv4 returned as my public ...
718
votes
3answers
140k views

Transatlantic ping faster than sending a pixel to the screen?

John Carmack tweeted, I can send an IP packet to Europe faster than I can send a pixel to the screen. How f’d up is that? And if this weren’t John Carmack, I’d file it under “the interwebs being ...