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Topic: Reverse DNS lookup

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	DNSstuff: How Reverse DNS Works (Site not responding. Last check: 2007-10-19)
		You let them know what DNS servers are responsible for the reverse DNS entries for your IPs (or, they can enter the reverse DNS entries on their DNS servers), and your ISP gives this information out when their DNS servers get queried for your reverse DNS entries.
		Then, anyone in the world can look up the reverse DNS entries for your IPs, and you can return any hostnames you want (whether or not you have control over those domains, although you should have permission to point them to hostnames that are not on your domains).
		So for both standard DNS and reverse DNS, there are two steps: [1] You need DNS servers, and [2] You need to tell the right company (your registrar for standard DNS lookups, or your ISP for reverse DNS lookups) where your DNS servers are located.
	www.dnsstuff.com /info/revdns.htm (871 words)

	DNS Lookups
		A DNS lookup uses an Internet domain name to find an IP address, where a reverse DNS lookup is using an Internet IP address to find a domain name.
		Reverse DNS lookup technique is able to identify if the sending e-mail server is legitimate and has a valid host name.
		The receiving server performs a reverse DNS lookup on the IP address of the incoming connection and checks if there is a valid domain name associated to it.
	www.postcastserver.com /help/DNS_Lookups.aspx (907 words)

	Reverse Dns Lookup
		Reverse DNS lookup - In the context of the Internet Protocol and the Domain Name System, a reverse lookup is often referred to simply as reverse resolving, or more specifically reverse DNS lookups.
		Typically, DNS is used to determine what IP address is associated with a given hostname; so to reverse resolve a known IP address is to lookup what...
		Reverse telephone directory - A reverse telephone directory (also known as a flpages directory or reverse phone lookup) is a collection of telephone numbers and associated customer details.
	fo70.growthsummit.com /reversednslookup.html (547 words)

	What is Reverse DNS Lookup?
		A typical DNS lookup is used to determine which IP address is associated with a hostname.
		A reverse DNS lookup is used for the opposite, to determine which hostname is associated with an IP address.
		Today, reverse DNS lookups (or reverse mapping) are used more frequently for security purposes to trace a hacker or spammer.
	www.the.net /tools/docs/reverse.php?PHPSESSID=f864ed647ee618e9755540bfc4154a6d (246 words)

	Reverse DNS Lookup Trouble - www.DNSstuff.com Message Board (Site not responding. Last check: 2007-10-19)
		We discovered that the reverse DNS lookups performed by MySQL were either timing out or were taking a very long time (5-10 seconds).
		My theory is that MySQL and our other socket service was always sending reverse lookups out onto the Internet which were then routed to these fl hole servers and that we started to experience problems during a time when these servers were slowed down or overwhelmed by traffic.
		I could test the theory by asking our network admin to disable reverse DNS lookups on our subnet, but he is understandably reluctant to do so given the problems we experienced.
	forums.dnsstuff.com /tool/post/dnsstuff/vpost?id=482031 (514 words)

	< eHelp < Cal Poly Pomona
		As this is often the case with spam, reverse DNS lookup was developed as a means by which servers could differentiate between valid emails sent from mail servers with IP addresses that match their DNS addresses, and those that don't match.
		As an added precaution, the reverse DNS lookup is followed by a forward DNS lookup, which, as the name suggests, is just the opposite process.
		While the pros of reverse DNS lookup far outweigh the cons, it is possible that legitimate email sent to Cal Poly Pomona email users may fail reverse DNS lookup and be subsequently blocked by the university’s email servers.
	www.csupomona.edu /~ehelp/email/reverse-dns.html (637 words)

	Reverse Lookup DNS
		One of the objectives of Project CURLA is to bring the reverse lookup DNS records for the UNINET Project space up to date.
		The reverse lookup zone files in the DNS provide the way in which the IP-address to hostname resolution takes place.
		In the DNS a PTR record is used to point back to the hostname for which an A record exists elsewhere in the DNS.
	www.tenet.ac.za /reverselookupdns.htm (1260 words)

	DNS Stuff: DNS tools, DNS hosting tests, WHOIS, traceroute, ping, and other network and domain name tools. (Site not responding. Last check: 2007-10-19)
		DNS Stuff: DNS tools, DNS hosting tests, WHOIS, traceroute, ping, and other network and domain name tools.
		In order to continue to grow and develop really cool DNS tools, we need your support by becoming a member.
		Grow the DNS side of your brain and protect your company with the most advanced set of tools and expertise on the planet.
	www.dnsstuff.com (280 words)

	CrystalTech Forums - DNS reverse lookup zone problem (Site not responding. Last check: 2007-10-19)
		To avoid this problem, I configured a reverse lookup zone in my dns server, specifying that IP number (63.135.110.13) should be addressed to a name (porta81.com.br).
		Its DNS name is a single label hostname with no domain (example: "host" rather than "host.microsoft.com").
		While the DNS server has only a single label name, all zones created will have default records (SOA and NS) created using only this single label name for the server's hostname.
	www.crystaltech.com /forum/topic.asp?TOPIC_ID=8527 (382 words)

	MobileDyne: Slow Transactions from DNS Lookups (Site not responding. Last check: 2007-10-19)
		A "reverse DNS lookup" is an attempt to get the domain name from the address.
		The fastest lookup is local, where the answer to the reverse DNS query is found without a network query at all.
		DNS translations are generally cached by the operating system, so after the first successful lookup, performance will be equal regardless of how fast the initial lookup was.
	www.mobiledyne.com /bmark/dns.html (297 words)

	MaraDNS - a security-aware DNS server
		Reverse DNS (sometimes called "reverse mapping") is set up by using PTR (pointer) records.
		If you wish to have a PTR (reverse DNS lookup; getting a DNS name from a numeric IP) record work on the internet at large, it is not a simple matter of just adding a record like this to a MaraDNS zonefile.
		DNS server, instead, contact the root DNS servers for a given in-addr.arpa name to get the reverse DNS lookup, just like they do with any other record type.
	www.maradns.org /faq.html (3185 words)

	Boosting Email Deliverability: The Role of DNS
		DNS is like one giant phone book in which you can look up a domain name, and find the IP address of the computer to which you’d like to connect.
		Because DNS is such an important way of establishing identity on the Internet, spammers will often forge domain names or IP addresses to hide where their mail is coming from.
		Performing these types of DNS lookups is an easy way for ISPs to differentiate legitimate email publishers from those who are out to scam their customers.
	www.lyris.com /resources/articles/200504dns.html (1095 words)

	Metasun Forum - "IP Address" vs "Remote Host"
		You're right, all the reverse DNS lookup things I found so far are using a component, with the exception of one.
		If it is being held responsible to perform the reverse lookup, the odds to have quite a few of theses addresses offline are pretty good, therefore implying unresolved addresses at reporting time.
		In the same line of thoughts, a number of days can be set for the life of a given set, thus forcing a new reverse DNS lookup to refresh the table at a preset interval.
	www.metasun.com /forum/topic.asp?TOPIC_ID=87 (1402 words)

	DomainsAreFree - Definition of Reverse DNS Lookup
		Reverse DNS lookup is the process of finding a host name corresponding to an IP address on a computer network such as the Internet using the Domain Name System.
		Reverse DNS lookup for IPv4 addresses uses the special domain
		Reverse DNS lookup for IPv6 addresses uses the special domain
	www.domainsarefree.com /glossary/Reverse_DNS_lookup.html (198 words)

	Description of DNS Reverse Lookups
		In a Domain Name System (DNS) environment, it is common for a user or an application to request a Reverse Lookup of a host name, given the IP address.
		Reverse Lookup files use the structure specified in RFC 1035.
		For example, if you have a network which is 150.10.0.0, then the Reverse Lookup file for this network would be 10.150.IN-ADDR.ARPA.
	support.microsoft.com /kb/164213/EN-US (466 words)

	Reverse Address Lookup - Rensselaer Help Desk
		These DNS files are shared with other ISPs so that each address and system is recorded.
		Reverse DNS lookups are an important component of our anti-spam implementation.
		If you are using a non-RPI ISP such as RoadRunner and they do not keep their DNS tables up-to-date you will not be able to access the mail.rpi.edu server.
	helpdesk.rpi.edu /update.do?artcenterkey=278 (343 words)

	Reverse DNS Lookup - www.DNSstuff.com Message Board (Site not responding. Last check: 2007-10-19)
		We have a 192.168.20.x Subnet setup under the Reverse Lookup Zones in DNS so it will not let me add anything like that.
		June 13, 2006 at 07:08 PM The EHLO/HELO and the reverse DNS entry are both correct -- it's fine for them to use different hostnames.
		If you want to have the "vanity reverse DNS", as it is called, you will need to contact your Internet provider, as only they can set up the reverse DNS (either setting the reverse DNS entry, or delegating authority to your DNS servers).
	forums.dnsstuff.com /tool/post/dnsstuff/vpost?id=1184902 (184 words)

	DNS Reverse lookup ... for email - Dev Shed
		Basically the DNS server will only successfully respond to reverse lookup queries if the entry can be resolved locally on the box.
		The issue is that my DNS server does not return values for reverse lookup querries that are not local to my DNS server.
		I can do a reverse lookup for my own domain and get a successfull response but if I do a reverse lookup for lets say yahoo.com is won't return the successful response.
	forums.devshed.com /dns-36/dns-reverse-lookup-for-email-55918.html (791 words)

	Reverse DNS Lookup Opinion - Dev Shed
		To combat the recent virus and SPAM they have implemented Reverse DNS lookup which has been great for us with one exception.
		This is the preferred method if your DNS needs to be fixed/setup fast and you don't have the time to bounce messages back and forth on a forum.
		Reverse DNS is getting more common everyday for spam issues AOL I believe is using RDNS now also.
	forums.devshed.com /dns-36/reverse-dns-lookup-opinion-123861.html (1645 words)

	The Answer Gang 68: reverse dns
		I have done a reverse dns lookup but it doesn't seem to be able to resolve.
		If a reverse lookup fails, it probably means there is no reverse record for that IP.
		There are also some ISPs out there who don't have reverse records at all, because they think that setting reverse records for their customers' IPs is not worth the time.
	linuxgazette.net /issue68/tag/9.html (470 words)

	Reverse DNS Lookup Tools
		If you have a class C (say) from your ISP, you can ask that they delegate the reverse ip address lookup zone to your DNS servers, in which case you control those in-addr.arpa PTR records.
		As Maurits implies, there's only one reverse mapping through PTR records from IP address to DNS name - this name can be considered a canonical name for the address.
		There are currently at least four DNS names, which are mostly in completely unrelated domains, which point to that address.
	channel9.msdn.com /ShowPost.aspx?PostID=86199 (407 words)

	dns reverse lookup (Site not responding. Last check: 2007-10-19)
		Reverse DNS lookup (rDNS) is a process to...
		FGA: "double reverse lookup" is not a security measure.
		Reverse lookup zones are also a must for domain functionality.
	www.gotdns.eu (1160 words)

	Requests for Comments (RFCs) about DNS (Site not responding. Last check: 2007-10-19)
		Mandates that DNS servers should accept, store and return unknown records of unknown type as is. Long overdue, but increases the complexity of implementating DNSSEC and dynamic updates.
		A nice generalisation of the DNS lookup algorithm, which can be viewed as a transformation of a domain name into the contents of the associated resource records via delegation rules stored in DNS servers.
		DNS isn't a good general directory service, but I don't see it being bad enough that alternatives have enough room to become established.
	www.dns.org.pl /rfc (4321 words)

	Create a DNS reverse lookup zone in Windows 2000 Server
		If you want your DNS server to support reverse lookups, you need to create a reverse lookup zone for each subnet you want to support.
		DNS allows two main types of queries: forward lookups and reverse lookups.
		For example, some e-mail servers perform a reverse DNS lookup on a sending mail server to determine that the host name offered by the remote mail server actually matches the IP address of the SMTP connection attempting to deliver the message.
	articles.techrepublic.com.com /5100-10879_11-5860903.html?part=rss&tag=feed&subj=tr (673 words)

	411ASP.NET: ASP.NET DNS Controls, Forward & Reverse DNS Lookup
		Full featured.NET DNS component that provides functionality to query a DNS server for a specific record(s), dynamically update records either securely or unsecurely, validate user's e-mail addresses and more...
		Dns Resolver is used to queries DNS servers for host information and programmatically query DNS servers for information, without having to worry about complex packet parsing.
		Sockets4DNS is a full featured.NET component that can perform DNS lookups using any DNS server.
	www.411asp.net /home/assembly/network/dns (240 words)

	DNS reverse lookup
		To define a custom proxy change to 'Use The following DNS server addresses:' and enter a Primary, then a secondary (if you have it), the secondary is the backup if your first one goes down.
		To do what you said (Have two DNS with separate records) you could split the computers on your network up and specify different DNS servers or have the primary DNS server point to the secondary DNS server to get address X. Primary give me www.intranet.com
		I want for some particular IPs belonging to this range (say for example 5 IPs) do their reverse lookup by another nameserver (no subnetting).
	www.firewall.cx /ftopicp-7.html (647 words)

	[Apnic-announce] Recent security update and reverse DNS lookup failures
		Details of reverse DNS failures -------------------------------- - Reverse DNS lookups to some networks in Japan and Korea failed to resolve on Sunday 23 October 2005 from approximately 2:30am to 10:30pm (UTC +10).
		_ Reverse DNS for ERX ranges from the APNIC region maintained in ARIN reverse DNS zones failed to resolve from 2:30am (UTC +10) Sunday 23 October 2005 to 1:00am (UTC +10) Monday 24 October 2005.
		We apologise for the inconvenience these reverse DNS failure may have caused you.
	www.apnic.net /mailing-lists/apnic-announce/archive/2005/10/msg00003.html (213 words)

	Reverse DNS lookup - Dev Shed
		Discuss Reverse DNS lookup in the DNS forum on Dev Shed.
		Reverse DNS lookup DNS forum discussing issues, servers, and configurations.
		And when I do a DNS transversal it come back saying that there is no PTR record.
	forums.devshed.com /dns-36/reverse-dns-lookup-355381.html (574 words)

	Forward/Reverse DNS Lookup, Other Network Tools - Lookup Server (Site not responding. Last check: 2007-10-19)
		Reverse DNS lookup is using an Internet IP address to find a domain name.
		When you enter the address for a Web site at your browser (the address is formally called the Uniform Resource Locator, or URL), the address is transmitted to a nearby router which does a forward DNS lookup in a routing table to locate the IP address.
		Occasionally you may see a Web page with a URL in which the domain name part is expressed as an IP address (sometimes called a dot address) and want to be able to see its domain name.
	www.lookupserver.com /reverse.php (210 words)

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