Find your Bitsquatting domain

bitsquatting.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char **argv)
{
  char *d = argv[1];
  size_t l = strlen(d);

  for (int i = 0; (size_t)i < l; i++)
    for (int k = 0; k < 8; k++)
    {
      char c = d[i] ^ (1 << k);
      if ((c >= 48 && c <= 57) || (c >= 97 && c <= 122))
      {
        char *s = malloc(l + 1);
        strcpy(s, d);
        s[i] = c;
        printf("> %s\n", s);
        free(s);
      }
    }

  puts("done");
  return 0;
}

Compile with gcc bitsquatting.c -o bitsquatting
Then run with ./bitsquatting yourdomain