try ivalid ptr with this regex
^\d+\.\d+\.\d+\.\d+$|^[^\.]+\.?$|\d{1,3}(\.|-|x)\d{1,3}(\.|-|x)\d{1,3}|dynamic|ddns|dns.org
^c-.*\.comcast\.net
^(cpe|rrcs)-.*\.(biz|res)\.rr\.com
^(pool|static)-.*\.verizon\.net
\.abo\.wanadoo\.fr
\.dhcp\..*\.charter\.com
\.dynamic\.hinet\.net
icip\.rima-tde\.net
\.user\.veloxzone\.com\.br
c.*\.virtua\.com\.br
^host.*\.(business|retail)\.telecomitalia\.it
p.*\.dip\.t-dialin\.net
\.(internetdsl|adsl|sdi)\.tpnet\.pl
\.(adsl|fbx)\.proxad\.net
^s[0-9].*\.shawcable\.net
\.(onocable|user)\.ono\.com
\.(pppoe|pptp)\.mtu-net\.ru
pool.*\.uni2\.es
-cust.*\.ntl\.com
^bzq-.*\.bezeqint\.net
\.(cable|stb)\.blueyonder\.co\.uk
\.(customer|dial-up|dsl)\.telesp\.net\.br
-[0-9]{2,3}-.*\.qwest\.net\.br
\.bb\.netvision\.net\.il
\.(dsl|dial|ipd)\.brasiltelecom\.net\.br
\.rev\.gaoland\.net
\.pools\.arcor-ip\.net
(ppp|static|revip).*\.asianet.co.th
\.dynamic\.qsc\.de
\.o\.pppool\.de
^pop-.*\.freesurf\.ch
^du.*\.as15444\.net
\.point\.ch
\.net4all-dns\.com
\.emv1\.net
\dailin.*\.tpnet\.de
\.orange\.fr
\.wanadoo\.fr
\.(dial|cable|adsl)\.wanadoo\.nl
\.kundenserver\.de
\.messagereach\.com
\.premiereglobal\.com
\.venturedirect\.com
\.xmr.*\.com
^ns.*\.ohv\.net
\.mhs\.ch
\.dynamicIP\.rima-tde\.net
\.dyn\.optonline\.net
^zaq.+\.zaq\.ne\.jp
^user.+\.mindspring\.com
\.ipt\.aol\.com
\.access\.telenet\.be
^host.*\.telecom\.net\.ar
^[^\.]*[0-9][^0-9\.]+[0-9]
^[^\.]*[0-9]{6}#changed 5 to 6 due to Yahoo Servers
^([^\.]+\.)?[0-9][^\.]*\.[^\.]+\..+\.[a-z]
^[^\.]*[0-9]\.[^\.]*[0-9]-[0-9]
^[^\.]*[0-9]\.[^\.]*[0-9]\.[^\.]+\..+\.
^(dhcp|dialup|ppp|adsl|DSL|dial|dynamic|host|HOST|pool|static|user|PC|pop|POP|client)[^\.]*[0-9]
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