使用检索全部的网站时| 与 IP 地址关联的域名，反向 DNS 查找和反向 IP 查找有什么区别？
这两个过程显示不同的输出。反向 dns 查找基于 PTR 记录 dns，通常显示的结果少于 ip 查找。但从来没有 PTR 记录存在。
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DNS 反向查找 (74.208.56.223)：
223.56.208.74.in-addr.arpa domain name pointer perfora.net.
IP 反向查找 (74.208.56.223)：
andrewslist.org 2016-03-05
awppwlocal5.org 2016-03-05
belgerado.com 2016-02-01
blet301.com 2016-03-11
camasbiz.com 2016-02-01
camassmokeshop.com 2016-02-01
canhazcode.com 2016-02-01
capturedmemoriesbyjb.com 2016-02-01
creativemediatechniques.com 2012-11-12
culturalimmersions.com 2012-11-12
easywifihotspot.com 2012-11-12
emeraldtree-inc.com 2016-02-01
epharma360.com 2016-02-01
erosionguardproducts.com 2016-02-01
execusummit-registration.com 2016-02-01
fatboyzsports.com 2016-02-01
firedistrict23.com 2016-02-01
hawkeyebars.com 2012-11-12
historybooksource.com 2016-02-01
hr-execusummit.com 2016-02-01
illuminatingeyes.com 2012-06-29
insidescooponrealestate.com 2012-11-12
inst-for-ip.org 2015-04-03
kylehalloutdoors.biz 2016-03-05
kylehalloutdoors.com 2015-11-14
kylehalloutdoors.info 2016-03-08
kylehalloutdoors.net 2016-03-01
kylehalloutdoors.org 2016-03-05
kylehalloutdoors.us 2016-03-08
lakesidebrewer.com 2015-11-14
lakesidebrewingco.com 2015-11-14
letters2home.com 2015-11-14
litgationsymposium.com 2015-11-14
noraparksgroup.info 2016-03-08
northslopewriters.com 2015-11-14
occursillo.org 2016-02-26
pawlek.com 2015-11-14
pinedecline.com 2015-11-14
pinggemporium.com 2015-11-14
riafunda.com 2015-11-14
savvysoccer.com 2015-11-14
schavonephotography.com 2015-11-14
schiavonephotography.com 2015-11-14
shadesofsoul.info 2015-10-20
shorelinecomputerservices.com 2015-11-14
sirclesaver.com 2012-06-29
specializedsafetytraining.com 2015-11-14
specializedsafetytraining.net 2016-03-01
swaramanthra.com 2015-03-23
teachbytech.org 2016-02-26
tofinocoffeecompany.com 2012-11-12
w3colors.com 2015-11-14
为什么从反向 ip 查找获得的信息不存在于 DNS 记录中？如果 DNS 记录中不存在这些信息，如何通过 ip 反向查找获取这些信息？输入一个 ip 地址，我想在输出中与它关联的所有主机。