Summary
| ASN | AS39790 Web4U s.r.o. |
| BGP | 81.91.88.0/21 |
| IPs with RDNS | 256 |
| Hosted Domains | 0 |
| Pingable IPs | 93 |
| Router IPs | 0 |
| 81.91.91.0 | virtual-server-vs50.91.91.81.in-addr.arpa | 0 |  | |
| 81.91.91.1 | gw-91-1.r4.web4u.cz | 0 |  | |
| 81.91.91.2 | unassigned-81-91-91-2.web4u.cz | 0 | | |
| 81.91.91.3 | unassigned-81-91-91-3.web4u.cz | 0 | | |
| 81.91.91.4 | d346.server4u.cz | 0 | | |
| 81.91.91.5 | unassigned-81-91-91-5.web4u.cz | 0 | | |
| 81.91.91.6 | unassigned-81-91-91-6.web4u.cz | 0 | | |
| 81.91.91.7 | z199.server4u.cz | 0 | | |
| 81.91.91.8 | z199.server4u.cz | 0 | | |
| 81.91.91.9 | z199.server4u.cz | 0 | | |
| 81.91.91.10 | mail.smartplus.cz | 0 | | |
| 81.91.91.11 | app.bakamika.cz | 0 | | |
| 81.91.91.12 | z194.server4u.cz | 0 | | |
| 81.91.91.13 | moodle10.pchelp.cz | 0 | | |
| 81.91.91.14 | d369-s18.server4u.cz | 0 | | |
| 81.91.91.15 | m253-1.server4u.cz | 0 | | |
| 81.91.91.16 | m253-2.server4u.cz | 0 | | |
| 81.91.91.17 | web4shop-db.server4u.cz | 0 | | |
| 81.91.91.18 | master.monitoring-rcsystem.com | 0 | | |
| 81.91.91.19 | web4shop-db.server4u.cz | 0 | | |
| 81.91.91.20 | web4shop-db.server4u.cz | 0 | | |
| 81.91.91.21 | d358.server4u.cz | 0 | | |
| 81.91.91.22 | d369-s20.server4u.cz | 0 | | |
| 81.91.91.23 | moodle4.pchelp.cz | 0 | | |
| 81.91.91.24 | m253-2.server4u.cz | 0 | | |
| 81.91.91.25 | d323-6.server4u.cz | 0 | | |
| 81.91.91.26 | d321.server4u.cz | 0 | | |
| 81.91.91.27 | z180.server4u.cz | 0 | | |
| 81.91.91.28 | web4shop-db.server4u.cz | 0 | | |
| 81.91.91.29 | d323-5.server4u.cz | 0 | | |
| 81.91.91.30 | lx-cust-d369-2.server4u.cz | 0 | | |
| 81.91.91.31 | moodle9.pchelp.cz | 0 | | |
| 81.91.91.32 | d323-4.server4u.cz | 0 | | |
| 81.91.91.33 | d323-3.server4u.cz | 0 | | |
| 81.91.91.34 | d323-1.server4u.cz | 0 | | |
| 81.91.91.35 | d323-2.server4u.cz | 0 | | |
| 81.91.91.36 | pardal.wpj.cz | 0 | | |
| 81.91.91.37 | d384.server4u.cz | 0 | | |
| 81.91.91.38 | d323-7.server4u.cz | 0 | | |
| 81.91.91.39 | m216-1.server4u.cz | 0 | | |
| 81.91.91.40 | d323-12.server4u.cz | 0 | | |
| 81.91.91.41 | smtp.majorshop.cz | 0 | | |
| 81.91.91.42 | d323-8.server4u.cz | 0 | | |
| 81.91.91.43 | d323-9.server4u.cz | 0 | | |
| 81.91.91.44 | m239.server4u.cz | 0 | | |
| 81.91.91.45 | d352.server4u.cz | 0 | | |
| 81.91.91.46 | d352.server4u.cz | 0 | | |
| 81.91.91.47 | d323-10.server4u.cz | 0 | | |
| 81.91.91.48 | wm215.web-media.cz | 0 | | |
| 81.91.91.49 | d338.server4u.cz | 0 | | |
| 81.91.91.50 | unassigned-81-91-91-50.web4u.cz | 0 | | |
| 81.91.91.51 | web4shop-old.server4u.cz | 0 | | |
| 81.91.91.52 | wm104.web-media.cz | 0 | | |
| 81.91.91.53 | wm105.web-media.cz | 0 | | |
| 81.91.91.54 | wm108.web-media.cz | 0 | | |
| 81.91.91.55 | d321.server4u.cz | 0 | | |
| 81.91.91.56 | dw016.server4u.cz | 0 | | |
| 81.91.91.57 | d369-s21.server4u.cz | 0 | | |
| 81.91.91.58 | unassigned-81-91-91-58.web4u.cz | 0 | | |
| 81.91.91.59 | unassigned-81-91-91-59.web4u.cz | 0 | | |
| 81.91.91.60 | unassigned-81-91-91-60.web4u.cz | 0 | | |
| 81.91.91.61 | unassigned-81-91-91-61.web4u.cz | 0 | | |
| 81.91.91.62 | unassigned-81-91-91-62.web4u.cz | 0 | | |
| 81.91.91.63 | unassigned-81-91-91-63.web4u.cz | 0 | | |
| 81.91.91.64 | unassigned-81-91-91-64.web4u.cz | 0 | | |
| 81.91.91.65 | unassigned-81-91-91-65.web4u.cz | 0 | | |
| 81.91.91.66 | unassigned-81-91-91-66.web4u.cz | 0 | | |
| 81.91.91.67 | unassigned-81-91-91-67.web4u.cz | 0 | | |
| 81.91.91.68 | wm106.web-media.cz | 0 | | |
| 81.91.91.69 | unassigned-81-91-91-69.web4u.cz | 0 | | |
| 81.91.91.70 | unassigned-81-91-91-70.web4u.cz | 0 | | |
| 81.91.91.71 | unassigned-81-91-91-71.web4u.cz | 0 | | |
| 81.91.91.72 | d323-11.server4u.cz | 0 | | |
| 81.91.91.73 | wm217.web-media.cz | 0 | | |
| 81.91.91.74 | wm218.web-media.cz | 0 | | |
| 81.91.91.75 | wm201.web-media.cz | 0 | | |
| 81.91.91.76 | d369-m-41.server4u.cz | 0 | | |
| 81.91.91.77 | d349.server4u.cz | 0 | | |
| 81.91.91.78 | d369-m-42.server4u.cz | 0 | | |
| 81.91.91.79 | d369-m-41.server4u.cz | 0 | | |
| 81.91.91.80 | d369-m-42.server4u.cz | 0 | | |
| 81.91.91.81 | unassigned-81-91-91-81.web4u.cz | 0 | | |
| 81.91.91.82 | unassigned-81-91-91-82.web4u.cz | 0 | | |
| 81.91.91.83 | wm216.web-media.cz | 0 | | |
| 81.91.91.84 | d357.server4u.cz | 0 | | |
| 81.91.91.85 | d369-s19.server4u.cz | 0 | | |
| 81.91.91.86 | z198.server4u.cz | 0 | | |
| 81.91.91.87 | z198.server4u.cz | 0 | | |
| 81.91.91.88 | z198.server4u.cz | 0 | | |
| 81.91.91.89 | z198.server4u.cz | 0 | | |
| 81.91.91.90 | d366.server4u.cz | 0 | | |
| 81.91.91.91 | m223.server4u.cz | 0 | | |
| 81.91.91.92 | m259.server4u.cz | 0 | | |
| 81.91.91.93 | m259.server4u.cz | 0 | | |
| 81.91.91.94 | unassigned-81-91-91-94.web4u.cz | 0 | | |
| 81.91.91.95 | unassigned-81-91-91-95.web4u.cz | 0 | | |
| 81.91.91.96 | unassigned-81-91-91-96.web4u.cz | 0 | | |
| 81.91.91.97 | unassigned-81-91-91-97.web4u.cz | 0 | | |
| 81.91.91.98 | m228.server4u.cz | 0 | | |
| 81.91.91.99 | d369-mlb1.server4u.cz | 0 | | |
| 81.91.91.100 | d371.server4u.cz | 0 | | |
| 81.91.91.101 | d369-mlb1.server4u.cz | 0 | | |
| 81.91.91.102 | d369-mlb2.server4u.cz | 0 | | |
| 81.91.91.103 | m241.server4u.cz | 0 | | |
| 81.91.91.104 | moodle11.myedu.cz | 0 | | |
| 81.91.91.105 | moodle12.pchelp.cz | 0 | | |
| 81.91.91.106 | moodle13.pchelp.cz | 0 | | |
| 81.91.91.107 | moodle14.pchelp.cz | 0 | | |
| 81.91.91.108 | m264.server4u.cz | 0 | | |
| 81.91.91.109 | m264.server4u.cz | 0 | | |
| 81.91.91.110 | z190.server4u.cz | 0 | | |
| 81.91.91.111 | z190.server4u.cz | 0 | | |
| 81.91.91.112 | ns.dnshost.cz | 0 | | |
| 81.91.91.113 | ns-2.dnshost.cz | 0 | | |
| 81.91.91.114 | flexibee.pripojky.cz | 0 | | |
| 81.91.91.115 | zabbix.pripojky.cz | 0 | | |
| 81.91.91.116 | nextcloud.pripojky.cz | 0 | | |
| 81.91.91.117 | nextcloud.evyt.cz | 0 | | |
| 81.91.91.118 | flexibee.evyt.cz | 0 | | |
| 81.91.91.119 | cloud.kavovyklub.cz | 0 | | |
| 81.91.91.120 | nextcloud.lbautomobile.cz | 0 | | |
| 81.91.91.121 | ns1.lbhost.cz | 0 | | |
| 81.91.91.122 | mail.evyt.cz | 0 | | |
| 81.91.91.123 | vpn-pha.pripojky.cz | 0 | | |
| 81.91.91.124 | z190.server4u.cz | 0 | | |
| 81.91.91.125 | z190.server4u.cz | 0 | | |
| 81.91.91.126 | d358.server4u.cz | 0 | | |
| 81.91.91.127 | unassigned-81-91-91-127.web4u.cz | 0 | | |
| 81.91.91.128 | z192.server4u.cz | 0 | | |
| 81.91.91.129 | z192.server4u.cz | 0 | | |
| 81.91.91.130 | z192.server4u.cz | 0 | | |
| 81.91.91.131 | z192.server4u.cz | 0 | | |
| 81.91.91.132 | z192.server4u.cz | 0 | | |
| 81.91.91.133 | z192.server4u.cz | 0 | | |
| 81.91.91.134 | z192.server4u.cz | 0 | | |
| 81.91.91.135 | z192.server4u.cz | 0 | | |
| 81.91.91.136 | z193.server4u.cz | 0 | | |
| 81.91.91.137 | z193.server4u.cz | 0 | | |
| 81.91.91.138 | z193.server4u.cz | 0 | | |
| 81.91.91.139 | z193.server4u.cz | 0 | | |
| 81.91.91.140 | z193.server4u.cz | 0 | | |
| 81.91.91.141 | z193.server4u.cz | 0 | | |
| 81.91.91.142 | z193.server4u.cz | 0 | | |
| 81.91.91.143 | z193.server4u.cz | 0 | | |
| 81.91.91.144 | d381.server4u.cz | 0 | | |
| 81.91.91.145 | d382.server4u.cz | 0 | | |
| 81.91.91.146 | z195.server4u.cz | 0 | | |
| 81.91.91.147 | lx-cust-d383-1.web4u.cz | 0 | | |
| 81.91.91.148 | lx-cust-d383-1.web4u.cz | 0 | | |
| 81.91.91.149 | lx-cust-d383-1.web4u.cz | 0 | | |
| 81.91.91.150 | lx-cust-d383-1.web4u.cz | 0 | | |
| 81.91.91.151 | lx-cust-d383-1.web4u.cz | 0 | | |
| 81.91.91.152 | m267.server4u.cz | 0 | | |
| 81.91.91.153 | unassigned-81-91-91-153.web4u.cz | 0 | | |
| 81.91.91.154 | unassigned-81-91-91-154.web4u.cz | 0 | | |
| 81.91.91.155 | unassigned-81-91-91-155.web4u.cz | 0 | | |
| 81.91.91.156 | unassigned-81-91-91-156.web4u.cz | 0 | | |
| 81.91.91.157 | unassigned-81-91-91-157.web4u.cz | 0 | | |
| 81.91.91.158 | unassigned-81-91-91-158.web4u.cz | 0 | | |
| 81.91.91.159 | unassigned-81-91-91-159.web4u.cz | 0 | | |
| 81.91.91.160 | xcp-ng.lbhost.cz | 0 | | |
| 81.91.91.161 | pfsense.lbhost.cz | 0 | | |
| 81.91.91.162 | z196.server4u.cz | 0 | | |
| 81.91.91.163 | z196.server4u.cz | 0 | | |
| 81.91.91.164 | z196.server4u.cz | 0 | | |
| 81.91.91.165 | z196.server4u.cz | 0 | | |
| 81.91.91.166 | z196.server4u.cz | 0 | | |
| 81.91.91.167 | z196.server4u.cz | 0 | | |
| 81.91.91.168 | z196.server4u.cz | 0 | | |
| 81.91.91.169 | z196.server4u.cz | 0 | | |
| 81.91.91.170 | z196.server4u.cz | 0 | | |
| 81.91.91.171 | z196.server4u.cz | 0 | | |
| 81.91.91.172 | z196.server4u.cz | 0 | | |
| 81.91.91.173 | z196.server4u.cz | 0 | | |
| 81.91.91.174 | z196.server4u.cz | 0 | | |
| 81.91.91.175 | z196.server4u.cz | 0 | | |
| 81.91.91.176 | unassigned-81-91-91-176.web4u.cz | 0 | | |
| 81.91.91.177 | unassigned-81-91-91-177.web4u.cz | 0 | | |
| 81.91.91.178 | unassigned-81-91-91-178.web4u.cz | 0 | | |
| 81.91.91.179 | unassigned-81-91-91-179.web4u.cz | 0 | | |
| 81.91.91.180 | unassigned-81-91-91-180.web4u.cz | 0 | | |
| 81.91.91.181 | unassigned-81-91-91-181.web4u.cz | 0 | | |
| 81.91.91.182 | unassigned-81-91-91-182.web4u.cz | 0 | | |
| 81.91.91.183 | unassigned-81-91-91-183.web4u.cz | 0 | | |
| 81.91.91.184 | unassigned-81-91-91-184.web4u.cz | 0 | | |
| 81.91.91.185 | unassigned-81-91-91-185.web4u.cz | 0 | | |
| 81.91.91.186 | unassigned-81-91-91-186.web4u.cz | 0 | | |
| 81.91.91.187 | unassigned-81-91-91-187.web4u.cz | 0 | | |
| 81.91.91.188 | unassigned-81-91-91-188.web4u.cz | 0 | | |
| 81.91.91.189 | unassigned-81-91-91-189.web4u.cz | 0 | | |
| 81.91.91.190 | unassigned-81-91-91-190.web4u.cz | 0 | | |
| 81.91.91.191 | unassigned-81-91-91-191.web4u.cz | 0 | | |
| 81.91.91.192 | unassigned-81-91-91-192.web4u.cz | 0 | | |
| 81.91.91.193 | unassigned-81-91-91-193.web4u.cz | 0 | | |
| 81.91.91.194 | unassigned-81-91-91-194.web4u.cz | 0 | | |
| 81.91.91.195 | unassigned-81-91-91-195.web4u.cz | 0 | | |
| 81.91.91.196 | unassigned-81-91-91-196.web4u.cz | 0 | | |
| 81.91.91.197 | unassigned-81-91-91-197.web4u.cz | 0 | | |
| 81.91.91.198 | unassigned-81-91-91-198.web4u.cz | 0 | | |
| 81.91.91.199 | unassigned-81-91-91-199.web4u.cz | 0 | | |
| 81.91.91.200 | web4shop-db.server4u.cz | 0 | | |
| 81.91.91.201 | unassigned-81-91-91-201.web4u.cz | 0 | | |
| 81.91.91.202 | unassigned-81-91-91-202.web4u.cz | 0 | | |
| 81.91.91.203 | unassigned-81-91-91-203.web4u.cz | 0 | | |
| 81.91.91.204 | unassigned-81-91-91-204.web4u.cz | 0 | | |
| 81.91.91.205 | unassigned-81-91-91-205.web4u.cz | 0 | | |
| 81.91.91.206 | unassigned-81-91-91-206.web4u.cz | 0 | | |
| 81.91.91.207 | unassigned-81-91-91-207.web4u.cz | 0 | | |
| 81.91.91.208 | unassigned-81-91-91-208.web4u.cz | 0 | | |
| 81.91.91.209 | unassigned-81-91-91-209.web4u.cz | 0 | | |
| 81.91.91.210 | unassigned-81-91-91-210.web4u.cz | 0 | | |
| 81.91.91.211 | unassigned-81-91-91-211.web4u.cz | 0 | | |
| 81.91.91.212 | unassigned-81-91-91-212.web4u.cz | 0 | | |
| 81.91.91.213 | unassigned-81-91-91-213.web4u.cz | 0 | | |
| 81.91.91.214 | unassigned-81-91-91-214.web4u.cz | 0 | | |
| 81.91.91.215 | unassigned-81-91-91-215.web4u.cz | 0 | | |
| 81.91.91.216 | unassigned-81-91-91-216.web4u.cz | 0 | | |
| 81.91.91.217 | unassigned-81-91-91-217.web4u.cz | 0 | | |
| 81.91.91.218 | unassigned-81-91-91-218.web4u.cz | 0 | | |
| 81.91.91.219 | unassigned-81-91-91-219.web4u.cz | 0 | | |
| 81.91.91.220 | unassigned-81-91-91-220.web4u.cz | 0 | | |
| 81.91.91.221 | unassigned-81-91-91-221.web4u.cz | 0 | | |
| 81.91.91.222 | unassigned-81-91-91-222.web4u.cz | 0 | | |
| 81.91.91.223 | unassigned-81-91-91-223.web4u.cz | 0 | | |
| 81.91.91.224 | unassigned-81-91-91-224.web4u.cz | 0 | | |
| 81.91.91.225 | unassigned-81-91-91-225.web4u.cz | 0 | | |
| 81.91.91.226 | unassigned-81-91-91-226.web4u.cz | 0 | | |
| 81.91.91.227 | unassigned-81-91-91-227.web4u.cz | 0 | | |
| 81.91.91.228 | unassigned-81-91-91-228.web4u.cz | 0 | | |
| 81.91.91.229 | unassigned-81-91-91-229.web4u.cz | 0 | | |
| 81.91.91.230 | unassigned-81-91-91-230.web4u.cz | 0 | | |
| 81.91.91.231 | unassigned-81-91-91-231.web4u.cz | 0 | | |
| 81.91.91.232 | unassigned-81-91-91-232.web4u.cz | 0 | | |
| 81.91.91.233 | unassigned-81-91-91-233.web4u.cz | 0 | | |
| 81.91.91.234 | unassigned-81-91-91-234.web4u.cz | 0 | | |
| 81.91.91.235 | unassigned-81-91-91-235.web4u.cz | 0 | | |
| 81.91.91.236 | unassigned-81-91-91-236.web4u.cz | 0 | | |
| 81.91.91.237 | unassigned-81-91-91-237.web4u.cz | 0 | | |
| 81.91.91.238 | unassigned-81-91-91-238.web4u.cz | 0 | | |
| 81.91.91.239 | unassigned-81-91-91-239.web4u.cz | 0 | | |
| 81.91.91.240 | unassigned-81-91-91-240.web4u.cz | 0 | | |
| 81.91.91.241 | unassigned-81-91-91-241.web4u.cz | 0 | | |
| 81.91.91.242 | unassigned-81-91-91-242.web4u.cz | 0 | | |
| 81.91.91.243 | unassigned-81-91-91-243.web4u.cz | 0 | | |
| 81.91.91.244 | unassigned-81-91-91-244.web4u.cz | 0 | | |
| 81.91.91.245 | unassigned-81-91-91-245.web4u.cz | 0 | | |
| 81.91.91.246 | unassigned-81-91-91-246.web4u.cz | 0 | | |
| 81.91.91.247 | unassigned-81-91-91-247.web4u.cz | 0 | | |
| 81.91.91.248 | unassigned-81-91-91-248.web4u.cz | 0 | | |
| 81.91.91.249 | unassigned-81-91-91-249.web4u.cz | 0 | | |
| 81.91.91.250 | unassigned-81-91-91-250.web4u.cz | 0 | | |
| 81.91.91.251 | unassigned-81-91-91-251.web4u.cz | 0 | | |
| 81.91.91.252 | unassigned-81-91-91-252.web4u.cz | 0 | | |
| 81.91.91.253 | unassigned-81-91-91-253.web4u.cz | 0 | | |
| 81.91.91.254 | unassigned-81-91-91-254.web4u.cz | 0 | | |
| 81.91.91.255 | virtual-server-vs5255.91.91.81.in-addr.arpa | 0 | | |
Traceroute
Below is a recent traceroute taken from the IPinfo ProbeNet to an IP in this range. Learn more.
$
traceroute -a -n -q1 -f4 81.91.91.12
traceroute to 81.91.91.12 (81.91.91.12): 64 hops max, 52 byte packets
5 *
6 *
7 *
9 *
Measurement taken from 
IPinfo ProbeNet in Helsinki, FI
IPinfo ProbeNet in Helsinki, FIOn