this post was submitted on 15 Nov 2023

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submitted 11 months ago by [email protected] to c/[email protected]

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[–] [email protected] 309 points 11 months ago (10 children)

Ok. This covers every ipv6 and ipv4 address.

"^\s*((([0-9A-Fa-f]{1,4}:){7}([0-9A-Fa-f]{1,4}|:))|(([0-9A-Fa-f]{1,4}:){6}(:[0-9A-Fa-f]{1,4}|((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3})|:))|(([0-9A-Fa-f]{1,4}:){5}(((:[0-9A-Fa-f]{1,4}){1,2})|:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3})|:))|(([0-9A-Fa-f]{1,4}:){4}(((:[0-9A-Fa-f]{1,4}){1,3})|((:[0-9A-Fa-f]{1,4})?:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:))|(([0-9A-Fa-f]{1,4}:){3}(((:[0-9A-Fa-f]{1,4}){1,4})|((:[0-9A-Fa-f]{1,4}){0,2}:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:))|(([0-9A-Fa-f]{1,4}:){2}(((:[0-9A-Fa-f]{1,4}){1,5})|((:[0-9A-Fa-f]{1,4}){0,3}:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:))|(([0-9A-Fa-f]{1,4}:){1}(((:[0-9A-Fa-f]{1,4}){1,6})|((:[0-9A-Fa-f]{1,4}){0,4}:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:))|(:(((:[0-9A-Fa-f]{1,4}){1,7})|((:[0-9A-Fa-f]{1,4}){0,5}:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:)))(%.+)?\s*$"

[–] [email protected] 105 points 11 months ago

Lord have mercy

[–] [email protected] 82 points 11 months ago* (last edited 11 months ago) (1 children)

Please don't. Use regex to find something that looks like an IP then build a real parser. This is madness, its's extremely hard to read and a mistake is almost impossible to spot. Not to mention that it's slow.

Just parse [0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3} using regex (for v4) and then have some code check that all the octets are valid (and store the IP as a u32).

[–] [email protected] 11 points 11 months ago (8 children)

And dupe check. 0.0.0.0 and 000.000.000.000 may both be valid, but they resolve the same

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[–] [email protected] 52 points 11 months ago (5 children)

IPv6 was a mistake. We should have just added an addition octet

[–] [email protected] 75 points 11 months ago (5 children)

That would allow for like, 2 trillion devices? Feels like a bandaid, my dude. Next you’re gonna suggest a giant ice cube in the ocean once a year to stop global warming.

[–] [email protected] 13 points 11 months ago (1 children)

So add two more octets:

Moat companies will still just use something like 10.0.13.37.0.1

[–] [email protected] 11 points 11 months ago (5 children)

IPv6 is not made with internal networks in mind lol

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[–] [email protected] 9 points 11 months ago (2 children)

And nuke the hurricanes

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[–] [email protected] 17 points 11 months ago (2 children)

Oh yeah, great, let's change the fundamental protocol on which all the networks in the world are based. Now two third of the devices in the world crashed because you tried to ping 192.168.0.0.1

[–] [email protected] 12 points 11 months ago

that WOULD be quite funny for the first second or 2....

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[–] [email protected] 37 points 11 months ago (1 children)

https://imgs.xkcd.com/comics/perl_problems.png

[–] [email protected] 18 points 11 months ago* (last edited 11 months ago) (5 children)

Made that joke in an interview once.

They didn't think it was funny. They truly thought Regex was the solution to, but never the cause of, all problems.

They wanted to make a Regex to verify every single address in the world. Dodged a bullet

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[–] [email protected] 31 points 11 months ago

It's always a treat to debug a regex of that size.

[–] [email protected] 28 points 11 months ago

I knew there would be someone with the regex.

[–] [email protected] 18 points 11 months ago* (last edited 11 months ago)

You're more of a perl programmer than network engineer :P

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[–] [email protected] 173 points 11 months ago (3 children)

0.0.0.0/0 0::0/0

You didn't specify it couldn't be in CIDR block notation...

[–] [email protected] 26 points 11 months ago

::/0

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[–] [email protected] 88 points 11 months ago (4 children)

0.0.0.0 /0 ::/0

SUCK MY DICK, GRU!

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[–] [email protected] 81 points 11 months ago* (last edited 11 months ago) (1 children)

:00 - :ff

Edit: Just learnt this can be also noted as:

:: - ::f

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[–] [email protected] 67 points 11 months ago (2 children)

0.0.0.0/0

[–] [email protected] 21 points 11 months ago (1 children)

Better hope the goon hasn't heard of IPv6 either, or you're toast

[–] [email protected] 22 points 11 months ago

::/0

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[–] [email protected] 65 points 11 months ago* (last edited 11 months ago)

This is gonna take a while...

0.0.0.0

0.0.0.1

0.0.0.2

0.0.0.3

...

[–] [email protected] 42 points 11 months ago* (last edited 11 months ago) (2 children)

0.0.0.0/0

::/0

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[–] [email protected] 40 points 11 months ago

0.0.0.0/0

[–] [email protected] 26 points 11 months ago* (last edited 11 months ago) (3 children)

This reminds me of something I saw online maybe 20 years ago now. Someone created a torrent with a name like "every IP address ever (hacking tool)" and uploaded it to Suprnova, which ended up having thousands of people seeding it. It was just a text file with every IPv4 from 0.0.0.0 to 255.255.255.255 😂

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[–] [email protected] 26 points 11 months ago* (last edited 11 months ago) (2 children)

ipv4 [0,255].[0,255].[0,255].[0,255]

ipv6 [0000,ffff]:[0000,ffff]:[0000,ffff]:[0000,ffff]:[0000,ffff]:[0000,ffff]:[0000,ffff]:[0000,ffff]

[–] [email protected] 14 points 11 months ago* (last edited 11 months ago) (1 children)

This excludes all the ipv4 ips that have a 0 in the 2nd, 3rd, and 4th octets. Sorry but we're going to have to revoke your Network Engineering credentials.

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[–] [email protected] 10 points 11 months ago (1 children)

Not to nitpick, but an IPv6 address is represented as eight groups of four hexadecimal digits separated by :. Like 2001:0db8:3333:4444:5555:6666:7777:8888.

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[–] [email protected] 23 points 11 months ago

127.0.0.1, I'm an introvert

[–] [email protected] 22 points 11 months ago (1 children)

one of them has a 7 I’m pretty sure

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[–] [email protected] 22 points 11 months ago

[–] [email protected] 20 points 11 months ago (1 children)

/32

[–] [email protected] 22 points 11 months ago

That's only 1 ip (single host)

[–] [email protected] 20 points 11 months ago

0.0.0.0/0

[–] [email protected] 16 points 11 months ago (1 children)

1 and 0. Some assembly required.

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[–] [email protected] 16 points 11 months ago

I mean if I name them do I have to own the domain or…

[–] [email protected] 15 points 11 months ago

0/0

[–] [email protected] 15 points 11 months ago* (last edited 11 months ago)

My PC's is now Bob, My router's Billy...

[–] [email protected] 12 points 11 months ago* (last edited 11 months ago)

0.0.0.0/0

[–] [email protected] 12 points 11 months ago (4 children)

I'll start.

0.0.0.1: Sophie

Your turn.

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[–] [email protected] 11 points 11 months ago

ipv6

[–] [email protected] 9 points 11 months ago (1 children)

Name every protocol

[–] [email protected] 10 points 11 months ago (1 children)

[–] [email protected] 13 points 11 months ago (1 children)

UDP

I'd love to tell you a joke about UDP but I'll never know if you get it.

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[–] [email protected] 9 points 11 months ago (1 children)

127.0.0.1

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