For those who want to try it at home:
ping 33333333
ping 55555555
I am sorry, two random Internet users in Korea and Germany, your IP addresses are simply special.
Best ping is 127.0.0.1
It always resolves!
Try pinging 127.1 - it is the same, but shorter.
Just another tipp from someone who learned TCP/IP from reading the sources over three decades ago...
even shorter: ping 0
That resolves to 0.0.0.0 - rarely useful
This is a special case. This resolves to 0.0.0.0, and technically cannot be routed. Some(!) systems use it as a kind of alias for all local network addresses, but it is not a given.
I'm aware. Conveniently this works on all the systems I've tried, making it useful for testing local services (e.g. ssh 0).
Voodoo! I had no idea.
Fun fact 127.0.0.1-127.255.255.254 is all localhost
Pretty insane that around 0.4% of all IPv4 addresses are wasted.
Wayyyyyy more than that is wasted.
Apple (and others) used to have an A class. I think they gave some of it back to the pool.
What about 127.255.255.255 ?
That is a broadcast address
Does the loopback broadcast address behave differently from any other of the loopback addresses?
ping 1.1 also works. It resolves to 1.0.0.1, which is Cloudflare's secondary DNS
It sure is better then ping 194.204.152.34 which I used to use.
Prior to cloud flare and Google doing DNS, a common one was 4.2.2.2 which is a level 3 IP.
Oh shit. Didn't know this either. Kind of like ipv6 in a way
IPv4 has some other features too.
$ ping 0x8.02004010
PING 0x8.02004010 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=116 time=22.8 ms
That'll be Google's root DNS server, using hexadecimal and octal representations.
Oh god why. This is like one step away from JavaScript math.
Wow, thank you!
Obligatory: Fuck Drake.
There are dozens of meme templates like this that you could have used instead
For those who are still confused, ping works with 32 bit unsigned integers. While there certainly are more uses, it's a much more convenient method for storing IP address in a database as it's easier to sort and index than 4 numbers separated by 4 periods
http://www.aboutmyip.com/AboutMyXApp/IP2Integer.jsp?ipAddress=1.1.1.1
it's so simple!
ping -c 4 $(mysql -u frodo -p keepyoursecrets -D /home/pingtargets.db -se "SELECT ip FROM servers ORDER BY RAND() LIMIT 1;")
Superior Ping:
I'm probably going to get downvoted to hell but I have to ask: Can someone please explain? I'm perpetually trying to expand my knowledge on the technical side of Linux.
This is the behaviour of inet_aton, which ping uses to translate ASCII representations of IPv4 addresses to a 32 bit number. Its manpage: https://man7.org/linux/man-pages/man3/inet_aton.3.html
It recognizes the usual quad decimal notation of course, but also addresses of the form a.b.c or a.b, or in this instance, a, with is taken to be a 32bit number.
Each part can also be written in hex or octal, with the right prefix, such that 10.012.0x800a is as valid form for 10.10.128.10.
Not all software use inet _aton to translate ASCII addresses. inet_pton for instance (which understands both v4 and v6) doesn't
I prefer:
ping 133742069
(probably lands you on a list tho...it's a US DoD IP)
Gotta make sure to do it from a Russian VPN too.
~~[https://iplocation.io/ip-whois-lookup/133.74.20.69](Looks like the Japanese Aerospace Agency) unless ~~I'm completely misunderstanding how entering a string of numbers without periods works in a ping
Ah yeah there's a little misunderstanding. IP addresses can be represented as 32-bit unsigned integer numbers, where each 8-bit chunk is separated by a dot.
So the conversion is: 133742069 (decimal) -> 00000111111110001011110111110101 (binary) -> 00000111.11111000.10111101.11110101 (8-bit chunks) -> 7.248.189.245 (resulting IP)
Thank you!!
ping 9.9.9.9
It's 1111 higher.
55555555
All addresses that that start in 555 were left open by the internet protocol developers just for movies and TV shows.
And the ones starting with 800 are for Pay Per View?
Ping ::1
Hint: :q!
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