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Hackertarget - Tools And Network Intelligence To Help Organizations With Attack Surface Discovery
Hackertarget - Tools And Network Intelligence To Help Organizations With Attack Surface Discovery #network #footprint #hacking
Use open source tools and network intelligence to help organizations with attack surface discovery and identification of security vulnerabilities. Identification of an organizations vulnerabilities is an impossible task without tactical intelligence on the network footprint. By combining open source intelligence with the worlds best open source security scanningtools, we enable your attackโฆ
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Reverse DNS in sendmail and how to disable it.
For some reason I found it exceedingly difficult to find a simple/clear explanation of how SendMail performs reverse DNS lookups. What follows are notes collected from 5+ sources on the interwebs. Hopefully this saves other folks some time (*grumble grumble grumble...).
Short answer: Sendmail does not have a granular setting to disable the lookup for a remote host's name. There are options to REQUIRE reverse DNS results (via the FEATURE(`require_rdns' setting) but nothing that completely turns reverse DNS off while leaving other DNS lookups intact.
Instead, sendmail bundles reverse DNS under a broader question of "should I use DNS at all?". In modern versions, that decision it determined by the hosts: setting in the respective Name Service Switch config file on a system. For Redhat and CentOS, that file is typically /etc/nsswitch.conf
If the hosts: setting has a value of hosts: files dns sendmail will check the local hosts file first for information and then try DNS.
OK. So before we go any further, let's ask an obvious question: Why does sendmail need to perform a reverse dns query at all? In theory, there are a few reasons:
The remote hostname is compared to the local hostname to prevent sendmail from connecting to itself and looping messages.
The remote hostname used in the HELO and EHLO greeting can be compared to the lookup value. If they're different, sendmail can complain.
The hostname value is used for a macro $s which can be used for various programmatic (rules, milter, etc) activity.
The name can be entered into headers and logs for easier tracking.
With me so far? Cool. So now that we have the basics, what is the actual reverse DNS workflow look like for the incoming connection? As per section 21.2.2 of the O'Reilly "bat book":
1) sendmail runs as a daemon, creates (and binds to) a socket, and listens for incoming SMTP traffic. 2) When a remote host connects to the local host, sendmail uses the accept library to accept the connection. 3) As part of the workflow, the accept routine provides the IP address of the remote server to sendmail. 4) sendmail then calls gethostbyaddr to lookup the IP.
Hmm, OK. So, where does this leave us? Well, if the sendmail host is in the middle of mailflow and the count of upstream hosts are relatively small, the easiest option may be to just add those upstream IPs to the /etc/hosts file. That allows the gethostbyaddrfunction to find what it needs locally and avoid using DNS.
Sources:
http://docstore.mik.ua/orelly/networking/sendmail/ch21_02.htm
http://www.sendmail.com/sm/open_source/support/support_faq/faq_ver_8_issues/#3.22
https://lildude.co.uk/howto-prevent-sendmail-from-using-dns
https://www.safaribooksonline.com/library/view/sendmail-4th-edition/9780596510299/ch24s09s108.html
https://www.safaribooksonline.com/library/view/sendmail-4th-edition/9780596510299/ch24s09s98.html
ansible speed up
Interesting post about rDNS in which ansible.cfg with GSSAPIAuthentication=no avoids doing reverse DNS lookups
Reverse DNS Check Workflow (Anti-Spam)
I deal with reverse dns issues so infrequently that I sometimes forget the specifics. Here's a brief summary of the workflow (if for no other reason than to remind myself):
Take the IP of an incoming connection and check the PTR DNS record for it.
Take the value of that PTR record and run a separate DNS query to check the A or AAAA record for it.
Check to see if the two records align with one another.
If there's a "match", then you've "confirmed" that there is a valid relationship between the owner of the DNS zone and the owner of the network that has been given the source IP address.
Admittedly, DNS has its own vulnerabilities (hence all the quotation marks) so it's not a perfect solution -- just one of many anti-spam techniques.

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Lead Forensics and Ruler Analytics - both super cool analytics solutions for tracking website visitors and see which companies have visited your website, but which is the better option and why? We've put them head-to-head to expose the best solution for you.
ํธ์ํฐ์ aol.com ์ด์ผ๊ธฐ๊ฐ ๋์์ ํ๋ ์๊ฐ๋๊ฑด๋ฐ ์ธ๊ตญ ๊ณ ๊ฐ๋ค์๊ฒ ๋ณด๋ด๋ ๋ฉ์ผ ์์คํ ์ ๊ตฌ์ถํ ๋ ์ฃผ์ํด์ผํ๋ ๊ฒ ์ค ํ๋๊ฐ ๋ฐ๋ก ์ญDNS(Reverse DNS)์ ๋๋ค. ์ผ๋ฐ์ ์ผ๋ก DNS๋ ๋ธ๋ผ์ฐ์ ์์ ๋๋ฉ์ธ์ ์ ๋ ฅํ๋ฉด IP์ฃผ์๋ก ๋ณํํด์ฃผ๋ ์ญํ ์ ํ๋๋ฐ ์ญDNS๋ ์ญ์ผ๋ก ๋ฉ์ผ์ด ๋ฐ์ก๋ ๋ฉ์ผ ์๋ฒ์ IP์ฃผ์๊ฐ ๋ฐ์ก์์ ๋ฉ์ผ ์ฃผ์ ๋๋ฉ์ธ๊ณผ ์ผ์นํ๋์ง ํ์ธํ ๋ ์ฌ์ฉ๋ฉ๋๋ค.
์๋ฅผ ๋ค์ด [email protected] ์ผ๋ก ๋ฐ์กํ ๋ฉ์ผ์ ๊ฒฝ์ฐ, ์ญDNS๋ฅผ ์กฐํํ์ฌ ๋ฉ์ผ ์๋ฒ์ ๋ํ ๋๋ฉ์ธ์ด naver.com๊ณผ ์ผ์นํ๋์ง ํ์ธ ํฉ๋๋ค. ๋ง์ฝ ์ผ์นํ์ง ์์ผ๋ฉด ์ฌ์นญ ๋ฉ์ผ์ด๊ฑฐ๋, ์๋ํ ์๋ฒ๋ฅผ ์ด์ฉํ ๋๋ ์คํธ ํญํ์ผ ๊ฐ๋ฅ์ฑ์ด ์์ฃ . ์ธ๊ตญ ๋ฉ์ผ ์๋น์ค์ ๊ฒฝ์ฐ ์ด๊ฒ์ด ์ผ์นํ์ง ์์ผ๋ฉด ์คํธ์ผ๋ก ๋ถ๋ฅํด๋ฒ๋ฆฌ๋ ๋ฉ์ผ ์๋น์ค๋ค์ด ์์ต๋๋ค.
๊ตญ๋ด์์๋ ์ญDNS์ ๋ฑ๋กํ๋ ๊ฒ์ KT์์ ๋ํํด์ฃผ๊ณ ์๋๋ฐ, ์ผ๋ฐ์ ์ผ๋ก ๋ฉ์ผ ๋๋ฉ์ธ ์ฃผ์์ ๋ฉ์ผ ์๋ฒ์ IP ์ฃผ์๊ฐ ๋ค๋ฅธ ๊ฒฝ์ฐ๋ ๊ฑฐ์ ์์ต๋๋ค. ๋ค์ด๋ฒ์์ ๋ณด๋ธ ๋ฉ์ผ์ ๋น์ฐํ ๋ค์ด๋ฒ์ ๋ฉ์ผ ์๋ฒ๋ฅผ ํตํด ๋ฐ์ก๋ฉ๋๋ค.
๋ค๋ง ์ด๊ฒ์ด ๋ค๋ฅธ ๊ฒฝ์ฐ๊ฐ ํธ์คํ ์๋น์ค ๋ฑ์์ ๋ง์ด ๋ฐ๊ฒฌ๋ฉ๋๋ค. ํธ์คํ ์ฌ์์ ์ผํ๋ชฐ์ ์๋ ๋ฐ์ ์ด์ฉํ๊ณ ์์ ๊ฒฝ์ฐ ๋ฉ์ผ ์๋น์ค๋ ํธ์คํ ์ฌ์์ ์ ๊ณตํด์ฃผ๋ ์๋น์ค๋ฅผ ์ฌ์ฉํ๋ ๊ฒฝ์ฐ๊ฐ ๋ง์๋ฐ์, ์ด๋ฐ ํธ์คํ ์ฌ ์๋น์ค ์ค์ ๋ฐ์ก์ ์ฃผ์๋ฅผ ๊ณ ๊ฐ ๋๋ฉ์ธ์ ์ฐ๊ฒฐํด์ฃผ๋ ์๋น์ค๋ค์ด ์์ต๋๋ค.
์๋ฅผ ๋ค์ด myhosting.net๋ผ๋ ์ฌ์ดํธ์ ํธ์คํ ์ ๋ฐ์ mysite.com์ด๋ผ๋ ์ฌ์ดํธ๋ฅผ ์ด์ํ๊ณ ์๋ค๋ฉด, ํธ์คํ ์ฌ์์ ์ ๊ณตํด์ฃผ๋ ์๋น์ค์ ๋ฐ๋ผ ์ ๋ฉ์ผ ์ฃผ์๋ฅผ [email protected] ์ด๋ผ๊ณ ๋ง๋ค ์ ์์ต๋๋ค. ์ด ๊ฒฝ์ฐ ๋ฉ์ผ ์๋ฒ๋ ๋น์ฐํ ํธ์คํ ์ฌ์์ ๋ณด์ ํ๊ณ ์์ต๋๋ค. ๊ทผ๋ฐ ํธ์คํ ์ฌ์์๋ ๋ฉ์ผ ์๋ฒ๋ฅผ ๊ณ ๊ฐ ๋น ํ๋์ฉ ๋๋๊ฒ ์๋๊ธฐ ๋๋ฌธ์(์์ ๋ญ๋น์ ๋๋ค.) myhosting.net์ด๋ผ๋ ์ฃผ์๋ฅผ ๋ฉ์ผ ์๋ฒ์ ๋ํ ๋๋ฉ์ธ์ผ๋ก ๋ฑ๋กํฉ๋๋ค.
์ด ์ํ์์ [email protected]์ด๋ผ๋ ๋ฐ์ก ์ฃผ์๋ก ์ธ๊ตญ์ ์๋ ๊ณ ๊ฐ์๊ฒ ๋ฉ์ผ์ ๋ณด๋ด๋ฉด ํด๋น ๊ณ ๊ฐ์ด ์ฌ์ฉํ๋ ๋ฉ์ผ ์์ ์๋ฒ์์๋ ์ญ DNS๋ฅผ ์กฐํํฉ๋๋ค. ๋ฐ์ก์ ๋ฉ์ผ ์๋ฒ์ IP๋ก ์กฐํ๋ฅผ ํด๋ณด๋ myhosting.net์ด๋ผ๋ ๋๋ฉ์ธ์ด ํธ์ถ๋ฉ๋๋ค. ๋ฐ์ก์์ ๋ฉ์ผ ์๋ฒ์ ๋๋ฉ์ธ์ด ์๋ก ๋ค๋ฅด๊ธฐ ๋๋ฌธ์ ์คํธ์ผ๋ก ์ธ์ํ๊ณ ๊ณ ๊ฐ์๊ฒ๋ ์ต์ข ์ ์ผ๋ก ์์ ์ด ๋์ง ์๊ฒ ๋ฉ๋๋ค.
์ด๋ฐ ๋ํ์ ์ธ ์๋น์ค๊ฐ aol.com์ ๋๋ค. ๊ณ ๊ฐ์ด aol.com์ ๋ฉ์ผ์ ์ฌ์ฉํ๊ณ ์์ ๊ฒฝ์ฐ ์ ๋ฐ ์ผ์ด์ค์ 100% ์คํธ์ผ๋ก ์ฒ๋ฆฌ๋ฉ๋๋ค. Gmail์ ์คํธ ์๊ณ ๋ฆฌ์ฆ์ ๊ทธ๋ ๊ฒ ๋จ์ํ์ง ์์์ ์์ ์ด ๋๊ธด ํฉ๋๋ค๋ง ์คํธ ์์ฌ ์์ธ ์ค ํ๋์ ๋๋ค.(์ฆ ์คํธ์ผ๋ก ํ๋จ๋ ๊ฐ๋ฅ์ฑ์ด ๋์์ง๋๋ค.)
์ด ๋ฌธ์ ๋ฅผ ํด๊ฒฐํ๋ ค๋ฉด ์ฌ์ดํธ๋ฅผ ํธ์คํ ์์ ์๋ํ๊ณ ์๋ค๊ณ ํ๋๋ผ๋ ๋ฉ์ผ ์๋ฒ๋ฅผ ์์ฒด ๋๋ฉ์ธ์ผ๋ก ํด์ ๋ฐ๋ก ๊ตฌ์ถํด์ ์ฐ๋์ง, ์๋๋ฉด ํธ์คํ ์ ๋ํ ๋๋ฉ์ธ์ผ๋ก ๋ฉ์ผ์ ๋ณด๋ด๋ ๋ฐฉ๋ฒ ๋ฐ์ ์์ต๋๋ค๋ง, ์ ์์ ๊ฒฝ์ฐ ๊ทธ๋ ๊ฒ ๊ตฌ์ถํ ์ ์๋ ์ฌ๋ ฅ์ ๊ฐ์ง ๊ณณ์ด ๋ง์ง ์๊ณ (๋ฉ์ผ ์๋ฒ๋ฅผ ๋ฐ๋ก ๋ ์ ๋๋ฉด ํธ์คํ ์ ์ธ ์ด์ ๊ฐ ์..), ํธ์คํ ์ฌ์ ๋๋ฉ์ธ์ผ๋ก ๋ฉ์ผ์ ๋ณด๋ด๋ฉด ๊ณ ๊ฐ์ ์ ๋ขฐ๋๊ฐ ๊ฐ์ํฉ๋๋ค.
ํ์ฌ ๊ตญ๋ด์์๋ ์ ๊ฐ ์๋ํ ์ญ DNS๋ฅผ ํตํด ์คํธ์ผ๋ก ๋ถ๋ฅํ๋ ๊ณณ์ ํ ๊ณณ๋ ์๋ ๊ฒ์ผ๋ก ์๊ณ ์์ต๋๋ค. ๋ฐ๋ผ์ ์ด๋ฐ ๋ฌธ์ ๋ ๊ฑฐ์ ํด์ธ์ ํ์ ๋์ด ๋ฐ์ํ๋ ๋ฌธ์ ๋ผ๊ณ ํ ์ ์๊ฒ ์ฃ .
๋ฌผ๋ก ์ธ๊ตญ ๊ณ ๊ฐ์๊ฒ ๋ฉ์ผ ์์ ์ด ์๋๋ ์ด์ ๋ ์ด๊ฒ ๋ง๊ณ ๋ ๋งค์ฐ ๋ง์ ์ด์ ๊ฐ ์์ต๋๋ค๋ง, ์์คํ ์ ์ธ ์ด์ ๋ ์ญDNS๋ก ์ธํด ๋ฐ์ํ๋ ๊ฒฝ์ฐ๊ฐ ๋ง์ต๋๋ค. ์ด๋ฐ ๋ฌธ์ ๊ฐ ์ฐ๋ฆฌ๋๋ผ์๋ง ์๋๊ฑด ์๋ํ ๋ฐ.. ์ธ๊ตญ ํธ์คํ ์ฌ์์๋ ์ด๋ค ๋ฐฉ์์ผ๋ก ๋ฌธ์ ๋ฅผ ํด๊ฒฐํ๊ณ ์๋์ง ๊ถ๊ธํด์ง๋ค์.
explore the neighborhood by looking at the PTR for the whole /24
Looking up the PTR resource records / reverses of the /24 neighbourhood of an IP address reveals lots of connections. To do so I use two bash functions. One function for printing all the reverses and one for creating an html file with pointers to more information. I named the first function ptr24 and it looks like that.
g0:~$cat .bashrc | head -14 function ptr24 { CNET=`echo $1|awk -F"." '{print $1"."$2"."$3}'` echo "PTR lookup for $CNET.0/24" for i in `seq 0 255`;do CUR=`dig +short -x $CNET.$i`; if [ -n "$CUR" ]; then echo -n "$CNET.$i -> "; echo $CUR; fi done }
So, if we want to explore the neighbourhood of the gnu.org web server we could do.
g0:~$dig +short gnu.org 140.186.70.148 g0:~$ptr24 140.186.70.148 PTR lookup for 140.186.70.0/24 140.186.70.1 -> ge-core1.qcy.gnu.org. 140.186.70.10 -> fencepost.gnu.org. 140.186.70.11 -> leviathan.gnu.org. ... 140.186.70.154 -> shop-dev.fsf.org. 140.186.70.155 -> testtaranis.gnu.org. 140.186.70.156 -> gplv3.fsf.org. 140.186.70.157 -> audio-video-dev.gnu.org. 140.186.70.253 -> ge-sw1.qcy.gnu.org. g0:~$
I named the second function ptr24htm and it looks like this.
g0:~$cat .bashrc |head -28|tail -15 function ptr24htm { CNET=`echo $1|awk -F"." '{print $1"."$2"."$3}'` echo "PTR lookup for $CNET.0/24<br />" for i in `seq 0 255`;do CUR=`dig +short -x $CNET.$i`; if [ -n "$CUR" ]; then echo -n "$CNET.$i -> "; echo "<a href=http://ipduh.com/dns/?$CUR>$CUR</a><br />"; fi done }
To produce a ptr.html of the gnu.org /24 neighbourhood we can do the following.
g0:~$ptr24htm `dig +short gnu.org` > ptr.html g0:~$
ptr.html PTR lookup for 140.186.70.0/24 140.186.70.1 -> ge-core1.qcy.gnu.org. 140.186.70.10 -> fencepost.gnu.org. 140.186.70.11 -> leviathan.gnu.org. 140.186.70.13 -> mail.fsf.org. 140.186.70.14 -> gnusenet.gnu.org. 140.186.70.15 -> fencepost-ssh.gnu.org. 140.186.70.17 -> lists.gnu.org. 140.186.70.20 -> ftp.gnu.org. 140.186.70.21 -> alpha.gnu.org. 140.186.70.22 -> ftp-upload.gnu.org. 140.186.70.23 -> webmail.fsf.org. 140.186.70.25 -> livestream.fsf.org. 140.186.70.26 -> sandbox.gnewsense.org. 140.186.70.30 -> svnweb.fsf.org. 140.186.70.31 -> spamhaus-rsync.fsf.org. 140.186.70.32 -> defectivebydesign.org. 140.186.70.33 -> galactica.fsf.org. 140.186.70.34 -> catalyst.fsf.org. 140.186.70.35 -> archive.gnewsense.org. 140.186.70.36 -> littlenemo.fsf.org. 140.186.70.37 -> labyrinth.fsf.org. 140.186.70.38 -> sycophant.fsf.org. 140.186.70.39 -> zaphod.gnu.org. 140.186.70.40 -> agilus.fsf.org. 140.186.70.41 -> bluemchen.kde.org. 140.186.70.42 -> agia.fsf.org. 140.186.70.43 -> debbugs.gnu.org. 140.186.70.44 -> config.fsf.org. 140.186.70.45 -> jamsession.fsf.org. 140.186.70.46 -> groups.fsf.org. 140.186.70.47 -> UNUSED-47.gnu.org. 140.186.70.48 -> tor.fsf.org. 140.186.70.49 -> archive.fsf.org. 140.186.70.50 -> smtp.member.fsf.org. 140.186.70.51 -> colonialone.fsf.org. 140.186.70.52 -> mirror.fsf.org. 140.186.70.53 -> sunjammer.sugarlabs.org. 140.186.70.54 -> linux-libre.fsfla.org. 140.186.70.56 -> news.swpat.org. 140.186.70.58 -> zope.fsf.org. 140.186.70.59 -> www-old.fsf.org. 140.186.70.60 -> my.fsf.org. 140.186.70.61 -> ldap.fsf.org. 140.186.70.62 -> code.autonomo.us. 140.186.70.63 -> www-dev.fsf.org. 140.186.70.64 -> my-dev.fsf.org. 140.186.70.65 -> cloud9.fsf.org. 140.186.70.66 -> blag.fsf.org. 140.186.70.67 -> windows7sins.org. 140.186.70.69 -> ftp-dev.gnu.org. 140.186.70.70 -> savannah.gnu.org. 140.186.70.71 -> savannah.nongnu.org. 140.186.70.72 -> vcs.savannah.gnu.org. 140.186.70.73 -> download.savannah.gnu.org. 140.186.70.74 -> mgt.savannah.gnu.org. 140.186.70.75 -> internal.savannah.gnu.org. 140.186.70.76 -> vpn.savannah.gnu.org. 140.186.70.80 -> groups-dev.fsf.org. 140.186.70.81 -> cas.fsf.org. 140.186.70.82 -> jabber.fsf.org. 140.186.70.83 -> brains.fsf.org. 140.186.70.84 -> balance.fsf.org. 140.186.70.85 -> eccles.gnewsense.org. 140.186.70.86 -> bloodnok.gnewsense.org. 140.186.70.87 -> seagoon.gnewsense.org. 140.186.70.88 -> config.gnewsense.org. 140.186.70.89 -> elpa.gnu.org. 140.186.70.90 -> heinlein.fsf.org. 140.186.70.91 -> mycroft.fsf.org. 140.186.70.92 -> eggs.gnu.org. 140.186.70.93 -> columbia.fsf.org. 140.186.70.94 -> directoryng-dev.fsf.org. 140.186.70.95 -> resolver1.fsf.org. 140.186.70.96 -> crm.fsf.org. 140.186.70.97 -> vinge.fsf.org. 140.186.70.98 -> nonce.fsf.org. 140.186.70.99 -> id-dev.fsf.org. 140.186.70.100 -> treehouse.sugarlabs.org. 140.186.70.101 -> UNUSED101.sugarlabs.org. 140.186.70.102 -> lightwave.sugarlabs.org. 140.186.70.103 -> UNUSED103.sugarlabs.org. 140.186.70.104 -> dextrose.sugarlabs.org. 140.186.70.105 -> UNUSED105.sugarlabs.org. 140.186.70.106 -> pootle.sugarlabs.org. 140.186.70.107 -> usr.sugarlabs.org. 140.186.70.108 -> UNUSED108.sugarlabs.org. 140.186.70.109 -> template-lucid.sugarlabs.org. 140.186.70.110 -> identity.sugarlabs.org. 140.186.70.111 -> UNUSED111.sugarlabs.org. 140.186.70.112 -> zatoichi.sugarlabs.org. 140.186.70.113 -> openlesson.sugarlabs.org. 140.186.70.114 -> UNUSED114.sugarlabs.org. 140.186.70.115 -> buildslave-ubuntu-lucid-64bit.sugarlabs.org. 140.186.70.116 -> UNUSED116.sugarlabs.org. 140.186.70.117 -> UNUSED117.sugarlabs.org. 140.186.70.118 -> UNUSED118.sugarlabs.org. 140.186.70.119 -> UNUSED119.sugarlabs.org. 140.186.70.120 -> UNUSED120.sugarlabs.org. 140.186.70.121 -> booki.treehouse.su. 140.186.70.122 -> anno.treehouse.su. 140.186.70.123 -> aslo-web.sugarlabs.org. 140.186.70.124 -> status.treehouse.su. 140.186.70.125 -> rt.sugarlabs.org. 140.186.70.126 -> schooltool.sugarlabs.org. 140.186.70.127 -> mapspress.sugarlabs.org. 140.186.70.128 -> monitoring.treehouse.su. 140.186.70.129 -> idea.sugarlabs.org. 140.186.70.130 -> dirac.fsf.org. 140.186.70.131 -> www.fsf.org. 140.186.70.132 -> lists.fsf.org. 140.186.70.133 -> testlucid.gnu.org. 140.186.70.134 -> resolver2.fsf.org. 140.186.70.135 -> seeder.gnu.org. 140.186.70.136 -> edit.fsf.org. 140.186.70.137 -> crm-dev.fsf.org. 140.186.70.138 -> logger.fsf.org. 140.186.70.139 -> dbd-dev.fsf.org. 140.186.70.140 -> social.gnu.org. 140.186.70.141 -> wiki-dev.swpat.org. 140.186.70.142 -> news-dev.swpat.org. 140.186.70.143 -> wiki.swpat.org. 140.186.70.144 -> bluemchen2.kde.org. 140.186.70.145 -> termite.fsf.org. 140.186.70.146 -> airhorn.fsf.org. 140.186.70.147 -> directory-dev.fsf.org. 140.186.70.148 -> wildebeest.gnu.org. 140.186.70.149 -> goodbye.gnu.org. 140.186.70.150 -> directory-p.fsf.org. 140.186.70.151 -> www.nongnu.org. 140.186.70.153 -> bitcoin.fsf.org. 140.186.70.154 -> shop-dev.fsf.org. 140.186.70.155 -> testtaranis.gnu.org. 140.186.70.156 -> gplv3.fsf.org. 140.186.70.157 -> audio-video-dev.gnu.org. 140.186.70.253 -> ge-sw1.qcy.gnu.org. backup of:bash functions to lookup all the PTR in a /24