This seems like a short IPv6 address 2001:dc3::3

[hopelessdemigod@mstdn.social]

This seems like a short IPv6 address 2001:dc3::3

What’s the deal?

[lackthereof@beige.party]

@HopelessDemigod
That's an unexpectedly large number of zeros

[hopelessdemigod@mstdn.social]

@lackthereof

It is?

[notyoursysadmin@infosec.exchange]

@HopelessDemigod In an IPv6 address, everything between double colons is a zero, and leading 0s in a group get dropped. So that address could be written as

2001:0dc3:0000:0000:0000:0000:0000:0003

[hopelessdemigod@mstdn.social]

@NotYourSysadmin

Interesting, so you only need to increment the last digit?

[notyoursysadmin@infosec.exchange]

@HopelessDemigod Do you mean when claiming IP addresses on a network for a statically-addressed device?

[hopelessdemigod@mstdn.social]

@NotYourSysadmin

Correct.

[notyoursysadmin@infosec.exchange]

@HopelessDemigod Yep, you can just increment the last digit in the address, so you'd use. ...::4

I'd guess you're on a /48 perhaps?

[hopelessdemigod@mstdn.social]

@NotYourSysadmin

What is the largest numerical digit you can use in the last position?

[notyoursysadmin@infosec.exchange]

@HopelessDemigod 9 is the highest base-10 numerical digit, but the addresses are written in hexadecimal, so you can go up to f. Each group is made up of four hex digits ranging from 0000 to ffff.