Shulou(Shulou.com)06/03 Report--

"Reverse DNS lookup" enter this word in Baidu, Google and other searches, you can see that many websites provide reverse DNS queries. I personally feel that the following website is easier to use, http://www.dnswatch.info/.

In the first query box, that is, DNS Lookup / IP lookup, enter your ip address. Here, take 58.251.139.211 as an example, click on the query, and a results page will come out to see the sentence Monitor performance and availability of your DNS Server (e.g. Ns2.cnc-gd.net) at the end:

DNSWatch > Reverse DNS Lookup for 58.251.139.211

Searching for 211.139.251.58.in-addr.arpa. PTR record at E.ROOT-SERVERS.NET. [192.203.230.10]... took 1 ms

Searching for 211.139.251.58.in-addr.arpa. PTR record at f.in-addr-servers.arpa. [193.0.9.1]... took 8 ms

Searching for ns2.lacnic.net. A record at E.ROOT-SERVERS.NET. [192.203.230.10]... took 1 ms

Searching for ns2.lacnic.net. A record at g.gtld-servers.net. [192.42.93.30]... took 154 ms

Searching for ns2.lacnic.net. A record at dns.anycast.lacnic.net. [200.3.13.10]... took 194 ms

Searching for 211.139.251.58.in-addr.arpa. PTR record at ns2.lacnic.net. [200.3.13.11]... took 202 ms

Searching for ns2.cnc-gd.net. A record at E.ROOT-SERVERS.NET. [192.203.230.10]... took 1 ms

Searching for ns2.cnc-gd.net. A record at k.gtld-servers.net. [192.52.178.30]... took 2 ms

Searching for ns2.cnc-gd.net. A record at ns1.cnc-gd.net. [221.4.9.48]... took 399 ms

Searching for 211.139.251.58.in-addr.arpa. PTR record at ns2.cnc-gd.net. [221.4.66.66]... took 376 ms

Domain Type TTL Answer

211.139.251.58.in-addr.arpa. PTR 86400 reverse.gdsz.cncnet.net.

Monitor performance and availability of your DNS Server (e.g. Ns2.cnc-gd.net)-starting at $1/month

Total elapsed query time: 1338 ms

Since these results are absolutely up-to-date they may differ from the results of your local nameserver.

It can take up to the specified "time to live" (TTL) for your nameserver to update its cache.

DNS queries have been sent from Frankfurt am Main, Germany

The DNS Server of your IP is e.g. Ns2.cnc-gd.net, please contact this domain name and do the reverse domain name resolution of 58.251.139.211.

Then you can ask your IP provider, that is, the ISP operator, and sometimes your host hosting provider, to add a reverse domain name resolution record to your IP, and generally reverse resolve the IP to the corresponding mx record of your mail server.

Append two simple test reverse DNS methods:

(1) Command: nslookup-qa=ptr 58.251.139.211 this can be seen simply

The results are as follows:

Server: resolver1.opendns.com

Address: 208.67.222.222

Non-authoritative response:

211.139.251.58.in-addr.arpa name = reverse.gdsz.cncnet.net

(2) Command: dig-x 58.251.139.211 + trace this plus + trace can see the detailed information

; DiG 9.3.0beta2-x 58.251.139.211 + trace

;; global options: printcmd

. 387585 IN NS a.root-servers.net.

. 387585 IN NS b.root-servers.net.

. 387585 IN NS c.root-servers.net.

. 387585 IN NS d.root-servers.net.

. 387585 IN NS e.root-servers.net.

. 387585 IN NS f.root-servers.net.

. 387585 IN NS g.root-servers.net.

. 387585 IN NS h.root-servers.net.

. 387585 IN NS i.root-servers.net.

. 387585 IN NS j.root-servers.net.

. 387585 IN NS k.root-servers.net.

. 387585 IN NS l.root-servers.net.

. 387585 IN NS m.root-servers.net.

;; Received 228 bytes from 208.67.222.2221553 (208.67.222.222) in 46 ms

In-addr.arpa. 172800 IN NS f.in-addr-servers.arpa.

In-addr.arpa. 172800 IN NS e.in-addr-servers.arpa.

In-addr.arpa. 172800 IN NS d.in-addr-servers.arpa.

In-addr.arpa. 172800 IN NS c.in-addr-servers.arpa.

In-addr.arpa. 172800 IN NS b.in-addr-servers.arpa.

In-addr.arpa. 172800 IN NS a.in-addr-servers.arpa.

;; Received 421 bytes from 198.41.0.4 ms 53 (a.root-servers.net) in 265 ms

58.in-addr.arpa. 86400 IN NS ns2.lacnic.net.

58.in-addr.arpa. 86400 IN NS ns4.apnic.net.

58.in-addr.arpa. 86400 IN NS sec1.authdns.ripe.net.

58.in-addr.arpa. 86400 IN NS ns1.apnic.net.

58.in-addr.arpa. 86400 IN NS tinnie.arin.net.

58.in-addr.arpa. 86400 IN NS apnic1.dnsnode.net.

58.in-addr.arpa. 86400 IN NS ns3.apnic.net.

;; Received 220 bytes from 193.0.9.1 ms 53 (f.in-addr-servers.arpa) in 280 ms

251.58.in-addr.arpa. 86400 IN NS ns2.cnc-gd.net.

251.58.in-addr.arpa. 86400 IN NS ns1.cnc-gd.net.

;; Received 91 bytes from 200.3.13.11 ms 53 (ns2.lacnic.net) in 357 ms

211.139.251.58.in-addr.arpa. 86400 IN PTR reverse.gdsz.cncnet.net.

139.251.58.in-addr.arpa. 86400 IN NS dns2-ftcg.gdsz.cncnet.net.

139.251.58.in-addr.arpa. 86400 IN NS dns1-ftcg.gdsz.cncnet.net.

Received 130 bytes from 221.4.66.66 ms 53 (ns2.cnc-gd.net) in 46 ms

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