[0] 0.21.189.18.in-addr.arpa.: domain name does not exist
[0] 1.21.189.18.in-addr.arpa.: domain name does not exist
[0] 2.21.189.18.in-addr.arpa.: domain name does not exist
[0] 3.21.189.18.in-addr.arpa.: domain name does not exist
[0] 4.21.189.18.in-addr.arpa.: domain name does not exist
[0] 5.21.189.18.in-addr.arpa.: domain name does not exist
[0] 6.21.189.18.in-addr.arpa.: domain name does not exist
[60] 7.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-7.dyn.MIT.EDU
[60] 8.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-8.dyn.MIT.EDU
[60] 9.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-9.dyn.MIT.EDU
[60] 10.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-10.dyn.MIT.EDU
[0] 11.21.189.18.in-addr.arpa.: domain name does not exist
[0] 12.21.189.18.in-addr.arpa.: domain name does not exist
[0] 13.21.189.18.in-addr.arpa.: domain name does not exist
[0] 14.21.189.18.in-addr.arpa.: domain name does not exist
[60] 15.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-15.dyn.MIT.EDU
[60] 16.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-16.dyn.MIT.EDU
[60] 17.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-17.dyn.MIT.EDU
[60] 18.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-18.dyn.MIT.EDU
[0] 19.21.189.18.in-addr.arpa.: domain name does not exist
[60] 20.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-20.dyn.MIT.EDU
[0] 21.21.189.18.in-addr.arpa.: domain name does not exist
[60] 22.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-22.dyn.MIT.EDU
[60] 23.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-23.dyn.MIT.EDU
[60] 24.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-24.dyn.MIT.EDU
[0] 25.21.189.18.in-addr.arpa.: domain name does not exist
[60] 26.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-26.dyn.MIT.EDU
[60] 27.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-27.dyn.MIT.EDU
[0] 28.21.189.18.in-addr.arpa.: domain name does not exist
[60] 29.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-29.dyn.MIT.EDU
[0] 30.21.189.18.in-addr.arpa.: domain name does not exist
[60] 31.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-31.dyn.MIT.EDU
[0] 32.21.189.18.in-addr.arpa.: domain name does not exist
[60] 33.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-33.dyn.MIT.EDU
[60] 34.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-34.dyn.MIT.EDU
[60] 35.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-35.dyn.MIT.EDU
[0] 36.21.189.18.in-addr.arpa.: domain name does not exist
[0] 37.21.189.18.in-addr.arpa.: domain name does not exist
[60] 38.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-38.dyn.MIT.EDU
[60] 39.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-39.dyn.MIT.EDU
[60] 40.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-40.dyn.MIT.EDU
[60] 41.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-41.dyn.MIT.EDU
[60] 42.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-42.dyn.MIT.EDU
[0] 43.21.189.18.in-addr.arpa.: domain name does not exist
[0] 44.21.189.18.in-addr.arpa.: domain name does not exist
[60] 45.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-45.dyn.MIT.EDU
[0] 46.21.189.18.in-addr.arpa.: domain name does not exist
[60] 47.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-47.dyn.MIT.EDU
[60] 48.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-48.dyn.MIT.EDU
[60] 49.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-49.dyn.MIT.EDU
[60] 50.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-50.dyn.MIT.EDU
[60] 51.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-51.dyn.MIT.EDU
[60] 52.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-52.dyn.MIT.EDU
[60] 53.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-53.dyn.MIT.EDU
[60] 54.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-54.dyn.MIT.EDU
[0] 55.21.189.18.in-addr.arpa.: domain name does not exist
[60] 56.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-56.dyn.MIT.EDU
[60] 57.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-57.dyn.MIT.EDU
[0] 58.21.189.18.in-addr.arpa.: domain name does not exist
[0] 59.21.189.18.in-addr.arpa.: domain name does not exist
[60] 60.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-60.dyn.MIT.EDU
[0] 61.21.189.18.in-addr.arpa.: domain name does not exist
[0] 62.21.189.18.in-addr.arpa.: domain name does not exist
[60] 63.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-63.dyn.MIT.EDU
[60] 64.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-64.dyn.MIT.EDU
[60] 65.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-65.dyn.MIT.EDU
[0] 66.21.189.18.in-addr.arpa.: domain name does not exist
[0] 67.21.189.18.in-addr.arpa.: domain name does not exist
[60] 68.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-68.dyn.MIT.EDU
[60] 69.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-69.dyn.MIT.EDU
[60] 70.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-70.dyn.MIT.EDU
[60] 71.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-71.dyn.MIT.EDU
[0] 72.21.189.18.in-addr.arpa.: domain name does not exist
[0] 73.21.189.18.in-addr.arpa.: domain name does not exist
[60] 74.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-74.dyn.MIT.EDU
[60] 75.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-75.dyn.MIT.EDU
[60] 76.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-76.dyn.MIT.EDU
[60] 77.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-77.dyn.MIT.EDU
[60] 78.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-78.dyn.MIT.EDU
[0] 79.21.189.18.in-addr.arpa.: domain name does not exist
[0] 80.21.189.18.in-addr.arpa.: domain name does not exist
[60] 81.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-81.dyn.MIT.EDU
[60] 82.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-82.dyn.MIT.EDU
[0] 83.21.189.18.in-addr.arpa.: domain name does not exist
[0] 84.21.189.18.in-addr.arpa.: domain name does not exist
[60] 85.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-85.dyn.MIT.EDU
[0] 86.21.189.18.in-addr.arpa.: domain name does not exist
[0] 87.21.189.18.in-addr.arpa.: domain name does not exist
[60] 88.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-88.dyn.MIT.EDU
[60] 89.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-89.dyn.MIT.EDU
[60] 90.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-90.dyn.MIT.EDU
[0] 91.21.189.18.in-addr.arpa.: domain name does not exist
[0] 92.21.189.18.in-addr.arpa.: domain name does not exist
[0] 93.21.189.18.in-addr.arpa.: domain name does not exist
[0] 94.21.189.18.in-addr.arpa.: domain name does not exist
[0] 95.21.189.18.in-addr.arpa.: domain name does not exist
[0] 96.21.189.18.in-addr.arpa.: domain name does not exist
[60] 97.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-97.dyn.MIT.EDU
[60] 98.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-98.dyn.MIT.EDU
[60] 99.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-99.dyn.MIT.EDU
[0] 100.21.189.18.in-addr.arpa.: domain name does not exist
[60] 101.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-101.dyn.MIT.EDU
[0] 102.21.189.18.in-addr.arpa.: domain name does not exist
[60] 103.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-103.dyn.MIT.EDU
[60] 104.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-104.dyn.MIT.EDU
[60] 105.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-105.dyn.MIT.EDU
[60] 106.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-106.dyn.MIT.EDU
[60] 107.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-107.dyn.MIT.EDU
[60] 108.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-108.dyn.MIT.EDU
[0] 109.21.189.18.in-addr.arpa.: domain name does not exist
[60] 110.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-110.dyn.MIT.EDU
[0] 111.21.189.18.in-addr.arpa.: domain name does not exist
[60] 112.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-112.dyn.MIT.EDU
[0] 113.21.189.18.in-addr.arpa.: domain name does not exist
[60] 114.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-114.dyn.MIT.EDU
[60] 115.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-115.dyn.MIT.EDU
[0] 116.21.189.18.in-addr.arpa.: domain name does not exist
[60] 117.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-117.dyn.MIT.EDU
[0] 118.21.189.18.in-addr.arpa.: domain name does not exist
[60] 119.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-119.dyn.MIT.EDU
[60] 120.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-120.dyn.MIT.EDU
[60] 121.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-121.dyn.MIT.EDU
[60] 122.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-122.dyn.MIT.EDU
[0] 123.21.189.18.in-addr.arpa.: domain name does not exist
[60] 124.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-124.dyn.MIT.EDU
[0] 125.21.189.18.in-addr.arpa.: domain name does not exist
[60] 126.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-126.dyn.MIT.EDU
[60] 127.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-127.dyn.MIT.EDU
[60] 128.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-128.dyn.MIT.EDU
[60] 129.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-129.dyn.MIT.EDU
[0] 130.21.189.18.in-addr.arpa.: domain name does not exist
[0] 131.21.189.18.in-addr.arpa.: domain name does not exist
[60] 132.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-132.dyn.MIT.EDU
[0] 133.21.189.18.in-addr.arpa.: domain name does not exist
[0] 134.21.189.18.in-addr.arpa.: domain name does not exist
[60] 135.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-135.dyn.MIT.EDU
[60] 136.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-136.dyn.MIT.EDU
[0] 137.21.189.18.in-addr.arpa.: domain name does not exist
[60] 138.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-138.dyn.MIT.EDU
[0] 139.21.189.18.in-addr.arpa.: domain name does not exist
[0] 140.21.189.18.in-addr.arpa.: domain name does not exist
[0] 141.21.189.18.in-addr.arpa.: domain name does not exist
[60] 142.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-142.dyn.MIT.EDU
[0] 143.21.189.18.in-addr.arpa.: domain name does not exist
[0] 144.21.189.18.in-addr.arpa.: domain name does not exist
[60] 145.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-145.dyn.MIT.EDU
[60] 146.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-146.dyn.MIT.EDU
[60] 147.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-147.dyn.MIT.EDU
[60] 148.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-148.dyn.MIT.EDU
[60] 149.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-149.dyn.MIT.EDU
[0] 150.21.189.18.in-addr.arpa.: domain name does not exist
[60] 151.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-151.dyn.MIT.EDU
[60] 152.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-152.dyn.MIT.EDU
[60] 153.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-153.dyn.MIT.EDU
[60] 154.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-154.dyn.MIT.EDU
[60] 155.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-155.dyn.MIT.EDU
[0] 156.21.189.18.in-addr.arpa.: domain name does not exist
[60] 157.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-157.dyn.MIT.EDU
[60] 158.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-158.dyn.MIT.EDU
[60] 159.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-159.dyn.MIT.EDU
[60] 160.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-160.dyn.MIT.EDU
[0] 161.21.189.18.in-addr.arpa.: domain name does not exist
[0] 162.21.189.18.in-addr.arpa.: domain name does not exist
[60] 163.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-163.dyn.MIT.EDU
[0] 164.21.189.18.in-addr.arpa.: domain name does not exist
[0] 165.21.189.18.in-addr.arpa.: domain name does not exist
[60] 166.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-166.dyn.MIT.EDU
[0] 167.21.189.18.in-addr.arpa.: domain name does not exist
[0] 168.21.189.18.in-addr.arpa.: domain name does not exist
[0] 169.21.189.18.in-addr.arpa.: domain name does not exist
[60] 170.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-170.dyn.MIT.EDU
[0] 171.21.189.18.in-addr.arpa.: domain name does not exist
[0] 172.21.189.18.in-addr.arpa.: domain name does not exist
[60] 173.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-173.dyn.MIT.EDU
[60] 174.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-174.dyn.MIT.EDU
[0] 175.21.189.18.in-addr.arpa.: domain name does not exist
[60] 176.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-176.dyn.MIT.EDU
[0] 177.21.189.18.in-addr.arpa.: domain name does not exist
[60] 178.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-178.dyn.MIT.EDU
[0] 179.21.189.18.in-addr.arpa.: domain name does not exist
[0] 180.21.189.18.in-addr.arpa.: domain name does not exist
[0] 181.21.189.18.in-addr.arpa.: domain name does not exist
[60] 182.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-182.dyn.MIT.EDU
[0] 183.21.189.18.in-addr.arpa.: domain name does not exist
[0] 184.21.189.18.in-addr.arpa.: domain name does not exist
[60] 185.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-185.dyn.MIT.EDU
[0] 186.21.189.18.in-addr.arpa.: domain name does not exist
[60] 187.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-187.dyn.MIT.EDU
[60] 188.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-188.dyn.MIT.EDU
[0] 189.21.189.18.in-addr.arpa.: domain name does not exist
[60] 190.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-190.dyn.MIT.EDU
[60] 191.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-191.dyn.MIT.EDU
[60] 192.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-192.dyn.MIT.EDU
[60] 193.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-193.dyn.MIT.EDU
[60] 194.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-194.dyn.MIT.EDU
[60] 195.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-195.dyn.MIT.EDU
[60] 196.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-196.dyn.MIT.EDU
[60] 197.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-197.dyn.MIT.EDU
[0] 198.21.189.18.in-addr.arpa.: domain name does not exist
[60] 199.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-199.dyn.MIT.EDU
[0] 200.21.189.18.in-addr.arpa.: domain name does not exist
[60] 201.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-201.dyn.MIT.EDU
[0] 202.21.189.18.in-addr.arpa.: domain name does not exist
[0] 203.21.189.18.in-addr.arpa.: domain name does not exist
[0] 204.21.189.18.in-addr.arpa.: domain name does not exist
[0] 205.21.189.18.in-addr.arpa.: domain name does not exist
[60] 206.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-206.dyn.MIT.EDU
[60] 207.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-207.dyn.MIT.EDU
[60] 208.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-208.dyn.MIT.EDU
[0] 209.21.189.18.in-addr.arpa.: domain name does not exist
[60] 210.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-210.dyn.MIT.EDU
[0] 211.21.189.18.in-addr.arpa.: domain name does not exist
[60] 212.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-212.dyn.MIT.EDU
[60] 213.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-213.dyn.MIT.EDU
[0] 214.21.189.18.in-addr.arpa.: domain name does not exist
[60] 215.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-215.dyn.MIT.EDU
[60] 216.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-216.dyn.MIT.EDU
[60] 217.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-217.dyn.MIT.EDU
[60] 218.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-218.dyn.MIT.EDU
[0] 219.21.189.18.in-addr.arpa.: domain name does not exist
[60] 220.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-220.dyn.MIT.EDU
[60] 221.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-221.dyn.MIT.EDU
[0] 222.21.189.18.in-addr.arpa.: domain name does not exist
[60] 223.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-223.dyn.MIT.EDU
[0] 224.21.189.18.in-addr.arpa.: domain name does not exist
[60] 225.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-225.dyn.MIT.EDU
[60] 226.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-226.dyn.MIT.EDU
[60] 227.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-227.dyn.MIT.EDU
[60] 228.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-228.dyn.MIT.EDU
[60] 229.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-229.dyn.MIT.EDU
[0] 230.21.189.18.in-addr.arpa.: domain name does not exist
[60] 231.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-231.dyn.MIT.EDU
[0] 232.21.189.18.in-addr.arpa.: domain name does not exist
[0] 233.21.189.18.in-addr.arpa.: domain name does not exist
[60] 234.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-234.dyn.MIT.EDU
[60] 235.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-235.dyn.MIT.EDU
[0] 236.21.189.18.in-addr.arpa.: domain name does not exist
[0] 237.21.189.18.in-addr.arpa.: domain name does not exist
[0] 238.21.189.18.in-addr.arpa.: domain name does not exist
[60] 239.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-239.dyn.MIT.EDU
[0] 240.21.189.18.in-addr.arpa.: domain name does not exist
[0] 241.21.189.18.in-addr.arpa.: domain name does not exist
[60] 242.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-242.dyn.MIT.EDU
[60] 243.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-243.dyn.MIT.EDU
[60] 244.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-244.dyn.MIT.EDU
[60] 245.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-245.dyn.MIT.EDU
[60] 246.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-246.dyn.MIT.EDU
[60] 247.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-247.dyn.MIT.EDU
[60] 248.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-248.dyn.MIT.EDU
[60] 249.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-249.dyn.MIT.EDU
[60] 250.21.189.18.in-addr.arpa. domain name pointer dhcp-18-189-21-250.dyn.MIT.EDU
[0] 251.21.189.18.in-addr.arpa.: domain name does not exist
[0] 252.21.189.18.in-addr.arpa.: domain name does not exist
[0] 253.21.189.18.in-addr.arpa.: domain name does not exist
[0] 254.21.189.18.in-addr.arpa.: domain name does not exist
[0] 255.21.189.18.in-addr.arpa.: domain name does not exist