[0] 0.51.189.18.in-addr.arpa.: domain name does not exist
[0] 1.51.189.18.in-addr.arpa.: domain name does not exist
[0] 2.51.189.18.in-addr.arpa.: domain name does not exist
[0] 3.51.189.18.in-addr.arpa.: domain name does not exist
[0] 4.51.189.18.in-addr.arpa.: domain name does not exist
[0] 5.51.189.18.in-addr.arpa.: domain name does not exist
[60] 6.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-6.dyn.mit.edu
[60] 7.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-7.dyn.mit.edu
[0] 8.51.189.18.in-addr.arpa.: domain name does not exist
[0] 9.51.189.18.in-addr.arpa.: domain name does not exist
[0] 10.51.189.18.in-addr.arpa.: domain name does not exist
[0] 11.51.189.18.in-addr.arpa.: domain name does not exist
[60] 12.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-12.dyn.mit.edu
[0] 13.51.189.18.in-addr.arpa.: domain name does not exist
[0] 14.51.189.18.in-addr.arpa.: domain name does not exist
[60] 15.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-15.dyn.mit.edu
[60] 16.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-16.dyn.mit.edu
[60] 17.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-17.dyn.mit.edu
[60] 18.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-18.dyn.mit.edu
[60] 19.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-19.dyn.mit.edu
[60] 20.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-20.dyn.mit.edu
[60] 21.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-21.dyn.mit.edu
[60] 22.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-22.dyn.mit.edu
[0] 23.51.189.18.in-addr.arpa.: domain name does not exist
[60] 24.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-24.dyn.mit.edu
[60] 25.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-25.dyn.mit.edu
[60] 26.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-26.dyn.mit.edu
[0] 27.51.189.18.in-addr.arpa.: domain name does not exist
[0] 28.51.189.18.in-addr.arpa.: domain name does not exist
[60] 29.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-29.dyn.mit.edu
[0] 30.51.189.18.in-addr.arpa.: domain name does not exist
[60] 31.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-31.dyn.mit.edu
[60] 32.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-32.dyn.mit.edu
[0] 33.51.189.18.in-addr.arpa.: domain name does not exist
[60] 34.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-34.dyn.mit.edu
[0] 35.51.189.18.in-addr.arpa.: domain name does not exist
[0] 36.51.189.18.in-addr.arpa.: domain name does not exist
[0] 37.51.189.18.in-addr.arpa.: domain name does not exist
[60] 38.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-38.dyn.mit.edu
[60] 39.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-39.dyn.mit.edu
[0] 40.51.189.18.in-addr.arpa.: domain name does not exist
[60] 41.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-41.dyn.mit.edu
[60] 42.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-42.dyn.mit.edu
[0] 43.51.189.18.in-addr.arpa.: domain name does not exist
[0] 44.51.189.18.in-addr.arpa.: domain name does not exist
[60] 45.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-45.dyn.mit.edu
[60] 46.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-46.dyn.mit.edu
[0] 47.51.189.18.in-addr.arpa.: domain name does not exist
[60] 48.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-48.dyn.mit.edu
[0] 49.51.189.18.in-addr.arpa.: domain name does not exist
[0] 50.51.189.18.in-addr.arpa.: domain name does not exist
[0] 51.51.189.18.in-addr.arpa.: domain name does not exist
[60] 52.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-52.dyn.mit.edu
[60] 53.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-53.dyn.mit.edu
[0] 54.51.189.18.in-addr.arpa.: domain name does not exist
[60] 55.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-55.dyn.mit.edu
[0] 56.51.189.18.in-addr.arpa.: domain name does not exist
[60] 57.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-57.dyn.mit.edu
[0] 58.51.189.18.in-addr.arpa.: domain name does not exist
[60] 59.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-59.dyn.mit.edu
[0] 60.51.189.18.in-addr.arpa.: domain name does not exist
[60] 61.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-61.dyn.mit.edu
[60] 62.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-62.dyn.mit.edu
[0] 63.51.189.18.in-addr.arpa.: domain name does not exist
[0] 64.51.189.18.in-addr.arpa.: domain name does not exist
[60] 65.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-65.dyn.mit.edu
[60] 66.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-66.dyn.mit.edu
[60] 67.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-67.dyn.mit.edu
[0] 68.51.189.18.in-addr.arpa.: domain name does not exist
[60] 69.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-69.dyn.mit.edu
[0] 70.51.189.18.in-addr.arpa.: domain name does not exist
[60] 71.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-71.dyn.mit.edu
[0] 72.51.189.18.in-addr.arpa.: domain name does not exist
[60] 73.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-73.dyn.mit.edu
[0] 74.51.189.18.in-addr.arpa.: domain name does not exist
[0] 75.51.189.18.in-addr.arpa.: domain name does not exist
[0] 76.51.189.18.in-addr.arpa.: domain name does not exist
[60] 77.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-77.dyn.mit.edu
[0] 78.51.189.18.in-addr.arpa.: domain name does not exist
[0] 79.51.189.18.in-addr.arpa.: domain name does not exist
[0] 80.51.189.18.in-addr.arpa.: domain name does not exist
[60] 81.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-81.dyn.mit.edu
[0] 82.51.189.18.in-addr.arpa.: domain name does not exist
[60] 83.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-83.dyn.mit.edu
[60] 84.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-84.dyn.mit.edu
[60] 85.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-85.dyn.mit.edu
[60] 86.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-86.dyn.mit.edu
[0] 87.51.189.18.in-addr.arpa.: domain name does not exist
[60] 88.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-88.dyn.mit.edu
[60] 89.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-89.dyn.mit.edu
[0] 90.51.189.18.in-addr.arpa.: domain name does not exist
[0] 91.51.189.18.in-addr.arpa.: domain name does not exist
[60] 92.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-92.dyn.mit.edu
[0] 93.51.189.18.in-addr.arpa.: domain name does not exist
[0] 94.51.189.18.in-addr.arpa.: domain name does not exist
[0] 95.51.189.18.in-addr.arpa.: domain name does not exist
[60] 96.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-96.dyn.mit.edu
[60] 97.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-97.dyn.mit.edu
[60] 98.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-98.dyn.mit.edu
[0] 99.51.189.18.in-addr.arpa.: domain name does not exist
[0] 100.51.189.18.in-addr.arpa.: domain name does not exist
[0] 101.51.189.18.in-addr.arpa.: domain name does not exist
[60] 102.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-102.dyn.mit.edu
[0] 103.51.189.18.in-addr.arpa.: domain name does not exist
[0] 104.51.189.18.in-addr.arpa.: domain name does not exist
[60] 105.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-105.dyn.mit.edu
[0] 106.51.189.18.in-addr.arpa.: domain name does not exist
[60] 107.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-107.dyn.mit.edu
[60] 108.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-108.dyn.mit.edu
[0] 109.51.189.18.in-addr.arpa.: domain name does not exist
[60] 110.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-110.dyn.mit.edu
[60] 111.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-111.dyn.mit.edu
[0] 112.51.189.18.in-addr.arpa.: domain name does not exist
[0] 113.51.189.18.in-addr.arpa.: domain name does not exist
[0] 114.51.189.18.in-addr.arpa.: domain name does not exist
[60] 115.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-115.dyn.mit.edu
[60] 116.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-116.dyn.mit.edu
[0] 117.51.189.18.in-addr.arpa.: domain name does not exist
[0] 118.51.189.18.in-addr.arpa.: domain name does not exist
[60] 119.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-119.dyn.mit.edu
[60] 120.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-120.dyn.mit.edu
[0] 121.51.189.18.in-addr.arpa.: domain name does not exist
[0] 122.51.189.18.in-addr.arpa.: domain name does not exist
[60] 123.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-123.dyn.mit.edu
[60] 124.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-124.dyn.mit.edu
[0] 125.51.189.18.in-addr.arpa.: domain name does not exist
[60] 126.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-126.dyn.mit.edu
[60] 127.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-127.dyn.mit.edu
[60] 128.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-128.dyn.mit.edu
[60] 129.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-129.dyn.mit.edu
[60] 130.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-130.dyn.mit.edu
[60] 131.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-131.dyn.mit.edu
[0] 132.51.189.18.in-addr.arpa.: domain name does not exist
[60] 133.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-133.dyn.mit.edu
[0] 134.51.189.18.in-addr.arpa.: domain name does not exist
[60] 135.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-135.dyn.mit.edu
[0] 136.51.189.18.in-addr.arpa.: domain name does not exist
[60] 137.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-137.dyn.mit.edu
[60] 138.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-138.dyn.mit.edu
[60] 139.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-139.dyn.mit.edu
[60] 140.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-140.dyn.mit.edu
[0] 141.51.189.18.in-addr.arpa.: domain name does not exist
[60] 142.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-142.dyn.mit.edu
[0] 143.51.189.18.in-addr.arpa.: domain name does not exist
[0] 144.51.189.18.in-addr.arpa.: domain name does not exist
[60] 145.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-145.dyn.mit.edu
[0] 146.51.189.18.in-addr.arpa.: domain name does not exist
[60] 147.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-147.dyn.mit.edu
[60] 148.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-148.dyn.mit.edu
[60] 149.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-149.dyn.mit.edu
[0] 150.51.189.18.in-addr.arpa.: domain name does not exist
[0] 151.51.189.18.in-addr.arpa.: domain name does not exist
[0] 152.51.189.18.in-addr.arpa.: domain name does not exist
[60] 153.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-153.dyn.mit.edu
[60] 154.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-154.dyn.mit.edu
[60] 155.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-155.dyn.mit.edu
[0] 156.51.189.18.in-addr.arpa.: domain name does not exist
[0] 157.51.189.18.in-addr.arpa.: domain name does not exist
[0] 158.51.189.18.in-addr.arpa.: domain name does not exist
[0] 159.51.189.18.in-addr.arpa.: domain name does not exist
[60] 160.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-160.dyn.mit.edu
[60] 161.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-161.dyn.mit.edu
[0] 162.51.189.18.in-addr.arpa.: domain name does not exist
[60] 163.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-163.dyn.mit.edu
[0] 164.51.189.18.in-addr.arpa.: domain name does not exist
[60] 165.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-165.dyn.mit.edu
[60] 166.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-166.dyn.mit.edu
[60] 167.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-167.dyn.mit.edu
[0] 168.51.189.18.in-addr.arpa.: domain name does not exist
[60] 169.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-169.dyn.mit.edu
[0] 170.51.189.18.in-addr.arpa.: domain name does not exist
[60] 171.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-171.dyn.mit.edu
[0] 172.51.189.18.in-addr.arpa.: domain name does not exist
[60] 173.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-173.dyn.mit.edu
[60] 174.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-174.dyn.mit.edu
[0] 175.51.189.18.in-addr.arpa.: domain name does not exist
[60] 176.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-176.dyn.mit.edu
[60] 177.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-177.dyn.mit.edu
[0] 178.51.189.18.in-addr.arpa.: domain name does not exist
[60] 179.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-179.dyn.mit.edu
[0] 180.51.189.18.in-addr.arpa.: domain name does not exist
[60] 181.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-181.dyn.mit.edu
[60] 182.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-182.dyn.mit.edu
[60] 183.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-183.dyn.mit.edu
[0] 184.51.189.18.in-addr.arpa.: domain name does not exist
[60] 185.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-185.dyn.mit.edu
[60] 186.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-186.dyn.mit.edu
[60] 187.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-187.dyn.mit.edu
[60] 188.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-188.dyn.mit.edu
[0] 189.51.189.18.in-addr.arpa.: domain name does not exist
[0] 190.51.189.18.in-addr.arpa.: domain name does not exist
[60] 191.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-191.dyn.mit.edu
[60] 192.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-192.dyn.mit.edu
[0] 193.51.189.18.in-addr.arpa.: domain name does not exist
[0] 194.51.189.18.in-addr.arpa.: domain name does not exist
[60] 195.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-195.dyn.mit.edu
[60] 196.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-196.dyn.mit.edu
[0] 197.51.189.18.in-addr.arpa.: domain name does not exist
[0] 198.51.189.18.in-addr.arpa.: domain name does not exist
[0] 199.51.189.18.in-addr.arpa.: domain name does not exist
[0] 200.51.189.18.in-addr.arpa.: domain name does not exist
[60] 201.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-201.dyn.mit.edu
[60] 202.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-202.dyn.mit.edu
[60] 203.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-203.dyn.mit.edu
[0] 204.51.189.18.in-addr.arpa.: domain name does not exist
[60] 205.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-205.dyn.mit.edu
[60] 206.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-206.dyn.mit.edu
[60] 207.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-207.dyn.mit.edu
[60] 208.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-208.dyn.mit.edu
[60] 209.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-209.dyn.mit.edu
[0] 210.51.189.18.in-addr.arpa.: domain name does not exist
[60] 211.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-211.dyn.mit.edu
[0] 212.51.189.18.in-addr.arpa.: domain name does not exist
[0] 213.51.189.18.in-addr.arpa.: domain name does not exist
[0] 214.51.189.18.in-addr.arpa.: domain name does not exist
[0] 215.51.189.18.in-addr.arpa.: domain name does not exist
[0] 216.51.189.18.in-addr.arpa.: domain name does not exist
[0] 217.51.189.18.in-addr.arpa.: domain name does not exist
[0] 218.51.189.18.in-addr.arpa.: domain name does not exist
[60] 219.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-219.dyn.mit.edu
[60] 220.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-220.dyn.mit.edu
[60] 221.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-221.dyn.mit.edu
[60] 222.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-222.dyn.mit.edu
[60] 223.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-223.dyn.mit.edu
[0] 224.51.189.18.in-addr.arpa.: domain name does not exist
[60] 225.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-225.dyn.mit.edu
[0] 226.51.189.18.in-addr.arpa.: domain name does not exist
[60] 227.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-227.dyn.mit.edu
[60] 228.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-228.dyn.mit.edu
[0] 229.51.189.18.in-addr.arpa.: domain name does not exist
[0] 230.51.189.18.in-addr.arpa.: domain name does not exist
[0] 231.51.189.18.in-addr.arpa.: domain name does not exist
[0] 232.51.189.18.in-addr.arpa.: domain name does not exist
[60] 233.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-233.dyn.mit.edu
[0] 234.51.189.18.in-addr.arpa.: domain name does not exist
[0] 235.51.189.18.in-addr.arpa.: domain name does not exist
[0] 236.51.189.18.in-addr.arpa.: domain name does not exist
[60] 237.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-237.dyn.mit.edu
[60] 238.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-238.dyn.mit.edu
[0] 239.51.189.18.in-addr.arpa.: domain name does not exist
[0] 240.51.189.18.in-addr.arpa.: domain name does not exist
[0] 241.51.189.18.in-addr.arpa.: domain name does not exist
[60] 242.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-242.dyn.mit.edu
[0] 243.51.189.18.in-addr.arpa.: domain name does not exist
[60] 244.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-244.dyn.mit.edu
[0] 245.51.189.18.in-addr.arpa.: domain name does not exist
[60] 246.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-246.dyn.mit.edu
[60] 247.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-247.dyn.mit.edu
[0] 248.51.189.18.in-addr.arpa.: domain name does not exist
[60] 249.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-249.dyn.mit.edu
[60] 250.51.189.18.in-addr.arpa. domain name pointer dhcp-18-189-51-250.dyn.mit.edu
[0] 251.51.189.18.in-addr.arpa.: domain name does not exist
[0] 252.51.189.18.in-addr.arpa.: domain name does not exist
[0] 253.51.189.18.in-addr.arpa.: domain name does not exist
[0] 254.51.189.18.in-addr.arpa.: domain name does not exist
[0] 255.51.189.18.in-addr.arpa.: domain name does not exist