@b0rk 2001:db8::* !

@b0rk and those sectors of my brain are un-defragmentable, heh

@b0rk The Doom port is a nice giggle, imo

@b0rk yep, but in a past life I was a sysadmin

@b0rk more ASNs than I care to name

@b0rk so many it would take me hours to recall a majority of them

@b0rk Not only the RFC 1918 numbers but also the number 1918 for some reason.

@b0rk This one's from POSIX, but 111 (ECONNREFUSED) has been drilled into my head from debugging problems inside an Istio mesh. (Envoy prints the raw error number on connection failures.)

@b0rk I need to try for the ip6 ones now I guess

@b0rk
I voted for SO MANY, even though RFC 2119 (I remembered that number!) does not define how many that is.

@b0rk I tend to be of the Professor Henry Jones school ('I wrote it down so I wouldn't have to remember!') on things like that.

@b0rk This is the primary reason I haven't gone two feet in to IPv6. I've got so many IPv4 ranges permanently etched in my brain, but for some reason fc00::1 just won't stick.

@b0rk

For some nonstandard ports I use the same PIN of my ATM cards, so I have less numbers to remember 🤣

@b0rk curious what qualifies as “so many”

@b0rk

Oddly - I probably could not reel them off... but if I was in the moment needing one, or more of those numbers - they would popup in front of me - J.I.T. memory sourcing - I guess.

🤔

@b0rk define ‘many’.

@b0rk I try to avoid doing this at all costs. (/etc/services is for me). But I run DNS to not have to think hard about numbers.

@b0rk

I remember 129 was the NCP address for IMP 1, Host 2 (ucla-security).

@b0rk @harshad @JeremyMallin

what???

I sometimes almost have to look up my house number. (It’s 7. Just writing it down here to help me remember it next time I need it).

Sorry, but my relationship with numbers is one of mutual dislike.

@b0rk 25565! ⛏️

@b0rk 127.0.0.1, ::1

@b0rk "DNS is down, what's the IP for $machine" there's times when I seem to be a bipedal DNS...

@b0rk ieee754
802.11

@b0rk
208.218.130.5 and 208.218.130.20. Two former DNS servers from the now-defunct Galaxy Internet Services (gis.net)
@spacehobo

@b0rk 22, 80, 443

These are the only ones I know for sure what they are.

@b0rk a Very Long Time Ago, before DNS, at the university where I now work, the head of computing would print out the hosts files once a month to keep on their desk.

All hosts

The whole thing

The whole Internet

😀

@b0rk network engineering leaves you with many brain traumas including but not limited to storage of many esoteric numbers

@b0rk Yes!
but I try to prevent learning new numbers by reading the /etc/services file when I find one I don't know.

@b0rk
And many of the certification exams tested your ability to remember these numbers. Knowing these numbers has been useful when the high-order network analysis tools aren't readily available.

@b0rk recently added to the list:
"800-53B 5.1.1.2 p9" which is the chapter and verse NIST reference for "don't make me change my password every 90 days you absolute walnut"

@b0rk
Where's the 'can still remember the phone number and DNS address for a dialup ISP from the late 1990s' option?

(Such incredibly useful information. Meanwhile: where did I leave my glasses...)

@b0rk Yup. Always remember SYS 64738.

@b0rk I voted few. for sure I have in memory many, but lately I found that i confuses some. pops or imap? postgresql or mysql or another service? my low: confusing ftp control with ssh. We should stop memorising them. The good of ipv6 is that we should never ever memorise ipv6 addresses

@b0rk http error code 418 is better than 404
Prove me wrong :p

@b0rk
Yes, but TBH I had to memorize them to pass several exams.
I only use a few *manually* in practice nowadays, tools have gotten way better since.

@b0rk so many, but I do work for an ISP...

@b0rk I have in my memory the Telnet codes.

@b0rk Sad, but true. Also certain avation frequencies and physics constants. I mean, like, it's not a really useful thing to know Avogadro's number, but it's burned into my brain.

@b0rk …powers of 2 up to 131072… plus some like 192, 384, 768 from too much time spent programming 8-bit computers
…the local dev zoo: 8000, 8080
…standard ports for mysql, redis, etc.

@b0rk i remember the IP's of most devices on my local network :3

@b0rk You mean something like POKE 53280,1 ? 😜

@b0rk
At once so many and not enough.

Too many services don't use /etc/services to let me map names to ports. `getservbyname()` folks, learn it, use it.

@b0rk And abbreviations! So many abbreviations!

The following paragraph makes perfect sense to me:

You might already know that the latest version of HTTP runs on top of UDP rather than TCP, and incorporates TLS, formerly known as SSL, in itself. It should reduce the effect of RTT, among other things. Also we need to finally switch to IPv6 and say goodbye to CGNAT.

@b0rk
Me at work:
"Let's choose a nice round number, like 32"

@b0rk Yes although my brain simply gives up at the thought of remembering anything IPv6.

@b0rk yes! This got drilled into me at a weird place: working at a checkout for a supermarket. Had to remember all sorts of product codes. Then have kept up the habit ever sense.

@b0rk I used to have a lot memorized from self preservation when reading tcpdump output but then wireshark got all symbolic and stuff. Now it’s just a few IPv4 addresses on my home lan.

@b0rk Only UDP port 666: Doom!

@b0rk

You left out zero and one. /s

@b0rk 43200, 86400, 604800… the perils of running DNS for more than 5 minu^W^W300 seconds.

@b0rk SYS 64738, for those who remember 😏

@b0rk $FCE2 reset, $AB1E strout with the string pointer in A and Y, and a large number of opcodes. And $EA31 default interrupt which conveniently starts with$EA, the opcode for NOP to allow jumping into the second byte of a two byte statement for added obfuscation

@b0rk the repliers to this seem like a great group of people to follow!

@b0rk I never actively sat down to memorize them, but after a while I collected quite a bunch of these automatically.

@b0rk AS numbers also.

@b0rk I had a lot of IPs memorized in the early 2000s when me and my friends all got ADSL and had FTPs for sharing "totally legal" software and games.