Need ipv6 address generator

Ruriko

Is there a online tool or software where i can input subnet and get hundreds of random addresses from ipv6 subnet? google ain't helping me as it just gives me ipv6 calculators

Neoon

https://github.com/emden-norfolk/cidrl

MikeA

ChatGPT can do that in a second.

tentor

#include <stdio.h>
#include <time.h>
#include <stdlib.h>
#include <string.h>
#include <arpa/inet.h>
#include <sys/param.h>

int main(int argc, char** argv) {
  srand(time(NULL));

  if (argc == 4) {
    int mask = atoi(argv[3]);

    if (strcmp(argv[1], "-4") == 0) {
      if (mask > 32) {
        printf("invalid mask given\n");
    return 1;
      }

      struct in_addr addr;
      if (inet_pton(AF_INET, argv[2], (void*)&addr.s_addr) == 0) {
        printf("invalid address given\n");
        return 1;
      }

      // addr.s_addr = addr.s_addr & ((1 << (mask + 1)) - 1);

      addr.s_addr = addr.s_addr & ntohl((1 << (mask + 1)) - 1);
      int r = rand() >> mask;
      addr.s_addr = addr.s_addr | ntohl(r);

      printf("%d\n", htonl((int)addr.s_addr));
    }

    if (strcmp(argv[1], "-6") == 0) {
      if (mask > 128) {
        printf("invalid mask given\n");
    return 1;
      }

      mask = 128 - mask;

      struct in6_addr addr;
      if (inet_pton(AF_INET6, argv[2], (void*)&addr) == 0) {
        printf("invalid address given\n");
        return 1;
      }

      for (char i = 15; mask > 0; i--) {
        unsigned char m = (char)((1 << MIN(8, mask)) - 1);
        unsigned char r = (unsigned char)rand() & m/*0*/;
        addr.s6_addr[i] = addr.s6_addr[i] & (~m) | r;
        mask -= 8;
      }

      for (char i = 0; i < 16; i += 2) {
        printf("%x", (addr.s6_addr[i] << 8) +  addr.s6_addr[i + 1]);

    if (i != 14)
          printf(":");
      }
    }

    printf("\n");

    return 0;
  }

  return 1;
}

Then

gcc -o main{,.c}
./main -6 2a09:b280:fe00:: 48

Arguments used here are:

• -6 required for IPv6
• 2a09:b280:fe00:: the address of your IPv6 prefix
• 48 the prefix length (i.e. 2a09:b280:fe00::/48)

Run it as many times as you need to.

yoursunny

I often generate a random hexadecimal sequence with openssl rand -hex 8 and manually insert colons.

zenki

https://subnettingpractice.com/ipv6-subnet-calculator.html

let_rocks

I've used https://gist.github.com/Larcaster/bc97460a47f1efc73e4f1a75af684efb before.

greenhost_cloud

@Ruriko said:
Is there a online tool or software where i can input subnet and get hundreds of random addresses from ipv6 subnet? google ain't helping me as it just gives me ipv6 calculators

Yes, you can use online tools like the IPv6 Random Address Generator to input a subnet and generate hundreds of random IPv6 addresses from that subnet.

kevinds

@Ruriko said:
Is there a online tool or software where i can input subnet and get hundreds of random addresses from ipv6 subnet?

You are putting too much effort into this..

Generate random hex digits, put them at the end of your prefix, that is it.

raindog308

@yoursunny said: I often generate a random hexadecimal sequence with openssl rand -hex 8 and manually insert colons.

@kevinds said: Generate random hex digits, put them at the end of your prefix, that is it.

These solutions are not going to collapse zeroes as is the norm in IPv6 addresses, though OP may not need that.

WhiteRoseG

@yoursunny Has ipv9 generator ?

kevinds

@raindog308 said:
These solutions are not going to collapse zeroes as is the norm in IPv6 addresses, though OP may not need that.

Randomly generated addresses won't have that many 0s for that to matter.

Ruriko

@kevinds said:

@Ruriko said:
Is there a online tool or software where i can input subnet and get hundreds of random addresses from ipv6 subnet?

You are putting too much effort into this..

Generate random hex digits, put them at the end of your prefix, that is it.

But I want to generate a list of 1000 ipv6 random address. Doing it manual is too time consuming

kevinds

@Ruriko said:
But I want to generate a list of 1000 ipv6 random address. Doing it manual is too time consuming

Hardest part is only getting hex characters randomly.

Second hardest is choosing how you want the output..

serveradministrator

https://ip6.sh is a good one. You can generate as many as you want.

tototo

@Ruriko said:
But I want to generate a list of 1000 ipv6 random address. Doing it manual is too time consuming

prefix="2001:0db8:"
declare -a addresses
while [ ${#addresses[@]} -lt 1000 ]
do
    random_data=$(od -A n -t x1 -N 16 /dev/urandom | tr -d ' \n')
    ipv6_address="${prefix}"
    for ((j=0; j<16; j+=4))
    do
        ipv6_address+=":${random_data:$j:4}"
    done
    duplicate=0
    for addr in "${addresses[@]}"
    do
        if [ "$addr" == "$ipv6_address" ]; then
            duplicate=1
            break
        fi
    done
    if [ $duplicate -eq 0 ]; then
        addresses+=("$ipv6_address")
    fi
done
IFS=$'\n' sorted=($(sort <<<"${addresses[*]}"))
for addr in "${sorted[@]}"
do
    echo "$addr"
done

by ChatGPT

TimboJones

Plot twist: he uses someone else's prefix and doesn't work.

Or you can just turn on privacy and temporary addresses.