[0] 0.87.189.18.in-addr.arpa.: domain name does not exist
[0] 1.87.189.18.in-addr.arpa.: domain name does not exist
[0] 2.87.189.18.in-addr.arpa.: domain name does not exist
[0] 3.87.189.18.in-addr.arpa.: domain name does not exist
[0] 4.87.189.18.in-addr.arpa.: domain name does not exist
[60] 5.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-5.dyn.MIT.EDU
[60] 6.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-6.dyn.MIT.EDU
[60] 7.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-7.dyn.MIT.EDU
[0] 8.87.189.18.in-addr.arpa.: domain name does not exist
[0] 9.87.189.18.in-addr.arpa.: domain name does not exist
[0] 10.87.189.18.in-addr.arpa.: domain name does not exist
[60] 11.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-11.dyn.MIT.EDU
[0] 12.87.189.18.in-addr.arpa.: domain name does not exist
[0] 13.87.189.18.in-addr.arpa.: domain name does not exist
[60] 14.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-14.dyn.MIT.EDU
[60] 15.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-15.dyn.MIT.EDU
[60] 16.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-16.dyn.MIT.EDU
[60] 17.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-17.dyn.MIT.EDU
[0] 18.87.189.18.in-addr.arpa.: domain name does not exist
[60] 19.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-19.dyn.MIT.EDU
[60] 20.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-20.dyn.MIT.EDU
[0] 21.87.189.18.in-addr.arpa.: domain name does not exist
[60] 22.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-22.dyn.MIT.EDU
[60] 23.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-23.dyn.MIT.EDU
[60] 24.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-24.dyn.MIT.EDU
[60] 25.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-25.dyn.MIT.EDU
[0] 26.87.189.18.in-addr.arpa.: domain name does not exist
[0] 27.87.189.18.in-addr.arpa.: domain name does not exist
[0] 28.87.189.18.in-addr.arpa.: domain name does not exist
[60] 29.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-29.dyn.MIT.EDU
[0] 30.87.189.18.in-addr.arpa.: domain name does not exist
[0] 31.87.189.18.in-addr.arpa.: domain name does not exist
[60] 32.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-32.dyn.MIT.EDU
[60] 33.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-33.dyn.MIT.EDU
[0] 34.87.189.18.in-addr.arpa.: domain name does not exist
[60] 35.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-35.dyn.MIT.EDU
[0] 36.87.189.18.in-addr.arpa.: domain name does not exist
[60] 37.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-37.dyn.MIT.EDU
[0] 38.87.189.18.in-addr.arpa.: domain name does not exist
[0] 39.87.189.18.in-addr.arpa.: domain name does not exist
[0] 40.87.189.18.in-addr.arpa.: domain name does not exist
[60] 41.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-41.dyn.MIT.EDU
[60] 42.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-42.dyn.MIT.EDU
[60] 43.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-43.dyn.MIT.EDU
[0] 44.87.189.18.in-addr.arpa.: domain name does not exist
[0] 45.87.189.18.in-addr.arpa.: domain name does not exist
[60] 46.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-46.dyn.MIT.EDU
[0] 47.87.189.18.in-addr.arpa.: domain name does not exist
[60] 48.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-48.dyn.MIT.EDU
[0] 49.87.189.18.in-addr.arpa.: domain name does not exist
[0] 50.87.189.18.in-addr.arpa.: domain name does not exist
[0] 51.87.189.18.in-addr.arpa.: domain name does not exist
[60] 52.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-52.dyn.MIT.EDU
[0] 53.87.189.18.in-addr.arpa.: domain name does not exist
[60] 54.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-54.dyn.MIT.EDU
[60] 55.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-55.dyn.MIT.EDU
[0] 56.87.189.18.in-addr.arpa.: domain name does not exist
[0] 57.87.189.18.in-addr.arpa.: domain name does not exist
[60] 58.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-58.dyn.MIT.EDU
[0] 59.87.189.18.in-addr.arpa.: domain name does not exist
[60] 60.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-60.dyn.MIT.EDU
[60] 61.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-61.dyn.MIT.EDU
[60] 62.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-62.dyn.MIT.EDU
[0] 63.87.189.18.in-addr.arpa.: domain name does not exist
[0] 64.87.189.18.in-addr.arpa.: domain name does not exist
[60] 65.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-65.dyn.MIT.EDU
[0] 66.87.189.18.in-addr.arpa.: domain name does not exist
[60] 67.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-67.dyn.MIT.EDU
[0] 68.87.189.18.in-addr.arpa.: domain name does not exist
[0] 69.87.189.18.in-addr.arpa.: domain name does not exist
[60] 70.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-70.dyn.MIT.EDU
[60] 71.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-71.dyn.MIT.EDU
[0] 72.87.189.18.in-addr.arpa.: domain name does not exist
[60] 73.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-73.dyn.MIT.EDU
[60] 74.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-74.dyn.MIT.EDU
[0] 75.87.189.18.in-addr.arpa.: domain name does not exist
[0] 76.87.189.18.in-addr.arpa.: domain name does not exist
[60] 77.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-77.dyn.MIT.EDU
[60] 78.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-78.dyn.MIT.EDU
[0] 79.87.189.18.in-addr.arpa.: domain name does not exist
[0] 80.87.189.18.in-addr.arpa.: domain name does not exist
[0] 81.87.189.18.in-addr.arpa.: domain name does not exist
[60] 82.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-82.dyn.MIT.EDU
[0] 83.87.189.18.in-addr.arpa.: domain name does not exist
[0] 84.87.189.18.in-addr.arpa.: domain name does not exist
[0] 85.87.189.18.in-addr.arpa.: domain name does not exist
[0] 86.87.189.18.in-addr.arpa.: domain name does not exist
[0] 87.87.189.18.in-addr.arpa.: domain name does not exist
[60] 88.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-88.dyn.MIT.EDU
[0] 89.87.189.18.in-addr.arpa.: domain name does not exist
[60] 90.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-90.dyn.MIT.EDU
[60] 91.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-91.dyn.MIT.EDU
[0] 92.87.189.18.in-addr.arpa.: domain name does not exist
[60] 93.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-93.dyn.MIT.EDU
[60] 94.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-94.dyn.MIT.EDU
[0] 95.87.189.18.in-addr.arpa.: domain name does not exist
[0] 96.87.189.18.in-addr.arpa.: domain name does not exist
[60] 97.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-97.dyn.MIT.EDU
[0] 98.87.189.18.in-addr.arpa.: domain name does not exist
[60] 99.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-99.dyn.MIT.EDU
[0] 100.87.189.18.in-addr.arpa.: domain name does not exist
[0] 101.87.189.18.in-addr.arpa.: domain name does not exist
[0] 102.87.189.18.in-addr.arpa.: domain name does not exist
[60] 103.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-103.dyn.MIT.EDU
[0] 104.87.189.18.in-addr.arpa.: domain name does not exist
[60] 105.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-105.dyn.MIT.EDU
[0] 106.87.189.18.in-addr.arpa.: domain name does not exist
[0] 107.87.189.18.in-addr.arpa.: domain name does not exist
[60] 108.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-108.dyn.MIT.EDU
[60] 109.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-109.dyn.MIT.EDU
[60] 110.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-110.dyn.MIT.EDU
[0] 111.87.189.18.in-addr.arpa.: domain name does not exist
[60] 112.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-112.dyn.MIT.EDU
[0] 113.87.189.18.in-addr.arpa.: domain name does not exist
[60] 114.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-114.dyn.MIT.EDU
[0] 115.87.189.18.in-addr.arpa.: domain name does not exist
[0] 116.87.189.18.in-addr.arpa.: domain name does not exist
[60] 117.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-117.dyn.MIT.EDU
[60] 118.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-118.dyn.MIT.EDU
[0] 119.87.189.18.in-addr.arpa.: domain name does not exist
[0] 120.87.189.18.in-addr.arpa.: domain name does not exist
[60] 121.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-121.dyn.MIT.EDU
[0] 122.87.189.18.in-addr.arpa.: domain name does not exist
[0] 123.87.189.18.in-addr.arpa.: domain name does not exist
[60] 124.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-124.dyn.MIT.EDU
[0] 125.87.189.18.in-addr.arpa.: domain name does not exist
[60] 126.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-126.dyn.MIT.EDU
[60] 127.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-127.dyn.MIT.EDU
[60] 128.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-128.dyn.MIT.EDU
[60] 129.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-129.dyn.MIT.EDU
[0] 130.87.189.18.in-addr.arpa.: domain name does not exist
[60] 131.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-131.dyn.MIT.EDU
[60] 132.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-132.dyn.MIT.EDU
[0] 133.87.189.18.in-addr.arpa.: domain name does not exist
[60] 134.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-134.dyn.MIT.EDU
[0] 135.87.189.18.in-addr.arpa.: domain name does not exist
[60] 136.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-136.dyn.MIT.EDU
[60] 137.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-137.dyn.MIT.EDU
[0] 138.87.189.18.in-addr.arpa.: domain name does not exist
[60] 139.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-139.dyn.MIT.EDU
[60] 140.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-140.dyn.MIT.EDU
[60] 141.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-141.dyn.MIT.EDU
[60] 142.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-142.dyn.MIT.EDU
[0] 143.87.189.18.in-addr.arpa.: domain name does not exist
[60] 144.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-144.dyn.MIT.EDU
[0] 145.87.189.18.in-addr.arpa.: domain name does not exist
[60] 146.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-146.dyn.MIT.EDU
[0] 147.87.189.18.in-addr.arpa.: domain name does not exist
[0] 148.87.189.18.in-addr.arpa.: domain name does not exist
[60] 149.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-149.dyn.MIT.EDU
[60] 150.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-150.dyn.MIT.EDU
[60] 151.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-151.dyn.MIT.EDU
[60] 152.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-152.dyn.MIT.EDU
[60] 153.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-153.dyn.MIT.EDU
[60] 154.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-154.dyn.MIT.EDU
[0] 155.87.189.18.in-addr.arpa.: domain name does not exist
[60] 156.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-156.dyn.MIT.EDU
[60] 157.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-157.dyn.MIT.EDU
[60] 158.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-158.dyn.MIT.EDU
[0] 159.87.189.18.in-addr.arpa.: domain name does not exist
[60] 160.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-160.dyn.MIT.EDU
[0] 161.87.189.18.in-addr.arpa.: domain name does not exist
[0] 162.87.189.18.in-addr.arpa.: domain name does not exist
[0] 163.87.189.18.in-addr.arpa.: domain name does not exist
[0] 164.87.189.18.in-addr.arpa.: domain name does not exist
[0] 165.87.189.18.in-addr.arpa.: domain name does not exist
[0] 166.87.189.18.in-addr.arpa.: domain name does not exist
[60] 167.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-167.dyn.MIT.EDU
[60] 168.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-168.dyn.MIT.EDU
[60] 169.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-169.dyn.MIT.EDU
[0] 170.87.189.18.in-addr.arpa.: domain name does not exist
[60] 171.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-171.dyn.MIT.EDU
[60] 172.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-172.dyn.MIT.EDU
[60] 173.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-173.dyn.MIT.EDU
[0] 174.87.189.18.in-addr.arpa.: domain name does not exist
[60] 175.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-175.dyn.MIT.EDU
[60] 176.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-176.dyn.MIT.EDU
[60] 177.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-177.dyn.MIT.EDU
[0] 178.87.189.18.in-addr.arpa.: domain name does not exist
[60] 179.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-179.dyn.MIT.EDU
[0] 180.87.189.18.in-addr.arpa.: domain name does not exist
[0] 181.87.189.18.in-addr.arpa.: domain name does not exist
[60] 182.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-182.dyn.MIT.EDU
[0] 183.87.189.18.in-addr.arpa.: domain name does not exist
[0] 184.87.189.18.in-addr.arpa.: domain name does not exist
[0] 185.87.189.18.in-addr.arpa.: domain name does not exist
[0] 186.87.189.18.in-addr.arpa.: domain name does not exist
[0] 187.87.189.18.in-addr.arpa.: domain name does not exist
[60] 188.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-188.dyn.MIT.EDU
[0] 189.87.189.18.in-addr.arpa.: domain name does not exist
[60] 190.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-190.dyn.MIT.EDU
[60] 191.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-191.dyn.MIT.EDU
[0] 192.87.189.18.in-addr.arpa.: domain name does not exist
[60] 193.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-193.dyn.MIT.EDU
[0] 194.87.189.18.in-addr.arpa.: domain name does not exist
[0] 195.87.189.18.in-addr.arpa.: domain name does not exist
[60] 196.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-196.dyn.MIT.EDU
[0] 197.87.189.18.in-addr.arpa.: domain name does not exist
[60] 198.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-198.dyn.MIT.EDU
[60] 199.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-199.dyn.MIT.EDU
[60] 200.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-200.dyn.MIT.EDU
[0] 201.87.189.18.in-addr.arpa.: domain name does not exist
[60] 202.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-202.dyn.MIT.EDU
[60] 203.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-203.dyn.MIT.EDU
[0] 204.87.189.18.in-addr.arpa.: domain name does not exist
[0] 205.87.189.18.in-addr.arpa.: domain name does not exist
[60] 206.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-206.dyn.MIT.EDU
[60] 207.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-207.dyn.MIT.EDU
[60] 208.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-208.dyn.MIT.EDU
[60] 209.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-209.dyn.MIT.EDU
[0] 210.87.189.18.in-addr.arpa.: domain name does not exist
[60] 211.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-211.dyn.MIT.EDU
[0] 212.87.189.18.in-addr.arpa.: domain name does not exist
[0] 213.87.189.18.in-addr.arpa.: domain name does not exist
[0] 214.87.189.18.in-addr.arpa.: domain name does not exist
[60] 215.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-215.dyn.MIT.EDU
[60] 216.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-216.dyn.MIT.EDU
[0] 217.87.189.18.in-addr.arpa.: domain name does not exist
[60] 218.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-218.dyn.MIT.EDU
[0] 219.87.189.18.in-addr.arpa.: domain name does not exist
[60] 220.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-220.dyn.MIT.EDU
[60] 221.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-221.dyn.MIT.EDU
[0] 222.87.189.18.in-addr.arpa.: domain name does not exist
[0] 223.87.189.18.in-addr.arpa.: domain name does not exist
[0] 224.87.189.18.in-addr.arpa.: domain name does not exist
[0] 225.87.189.18.in-addr.arpa.: domain name does not exist
[0] 226.87.189.18.in-addr.arpa.: domain name does not exist
[0] 227.87.189.18.in-addr.arpa.: domain name does not exist
[60] 228.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-228.dyn.MIT.EDU
[0] 229.87.189.18.in-addr.arpa.: domain name does not exist
[0] 230.87.189.18.in-addr.arpa.: domain name does not exist
[0] 231.87.189.18.in-addr.arpa.: domain name does not exist
[60] 232.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-232.dyn.MIT.EDU
[0] 233.87.189.18.in-addr.arpa.: domain name does not exist
[60] 234.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-234.dyn.MIT.EDU
[60] 235.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-235.dyn.MIT.EDU
[0] 236.87.189.18.in-addr.arpa.: domain name does not exist
[0] 237.87.189.18.in-addr.arpa.: domain name does not exist
[0] 238.87.189.18.in-addr.arpa.: domain name does not exist
[0] 239.87.189.18.in-addr.arpa.: domain name does not exist
[0] 240.87.189.18.in-addr.arpa.: domain name does not exist
[60] 241.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-241.dyn.MIT.EDU
[0] 242.87.189.18.in-addr.arpa.: domain name does not exist
[60] 243.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-243.dyn.MIT.EDU
[60] 244.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-244.dyn.MIT.EDU
[0] 245.87.189.18.in-addr.arpa.: domain name does not exist
[60] 246.87.189.18.in-addr.arpa. domain name pointer dhcp-18-189-87-246.dyn.MIT.EDU
[0] 247.87.189.18.in-addr.arpa.: domain name does not exist
[0] 248.87.189.18.in-addr.arpa.: domain name does not exist
[0] 249.87.189.18.in-addr.arpa.: domain name does not exist
[0] 250.87.189.18.in-addr.arpa.: domain name does not exist
[0] 251.87.189.18.in-addr.arpa.: domain name does not exist
[0] 252.87.189.18.in-addr.arpa.: domain name does not exist
[0] 253.87.189.18.in-addr.arpa.: domain name does not exist
[0] 254.87.189.18.in-addr.arpa.: domain name does not exist
[0] 255.87.189.18.in-addr.arpa.: domain name does not exist