Another alternative, if you're simply looking for ASN/CIDR information, is to use the routeviews project. host -t txt 51.51.51.51.asn.routeviews.org ... returns the ASN and CIDR block of the IP in question. Note that as usual, this is reversed dotted quad, so if your original IP is 1.2.3.4, you're querying 4.3.2.1.asn.routeviews.org More information on the routeviews project: http://www.routeviews.org/ If you want information on the ASN, you can still query WHOIS. Or you can hit the CIDR Report: http://www.cidr-report.org Example: $ host www.cidr-report.org www.cidr-report.org has address 203.133.248.2 $ host -t txt 2.248.133.203.asn.routeviews.org 2.248.133.203.asn.routeviews.org descriptive text "4608" "203.133.248.0" "24" karsten at zharben:~$ host -t txt 51.51.51.51.asn.routeviews.org 51.51.51.51.asn.routeviews.org descriptive text "4294967295" "0" "0" karsten at zharben:~$ host www.cidr-report.org www.cidr-report.org has address 203.133.248.2 karsten at zharben:~$ host -t text 2.248.133.103.asn.routeviews.org host: invalid type: text karsten at zharben:~$ host -t txt 2.248.133.103.asn.routeviews.org Host 2.248.133.103.asn.routeviews.org not found: 3(NXDOMAIN) karsten at zharben:~$ host -t txt 2.248.133.203.asn.routeviews.org 2.248.133.203.asn.routeviews.org descriptive text "4608" "203.133.248.0" "24" karsten at zharben:~$ whois n 4608 No whois server is known for this kind of object. karsten at zharben:~$ whois n!4608 bash: !4608: event not found karsten at zharben:~$ whois AS4608 % [whois.apnic.net node-5] % Whois data copyright terms http://www.apnic.net/db/dbcopyright.html as-block: AS4608 - AS4864 descr: APNIC ASN block remarks: These AS numbers are further assigned by APNIC remarks: to APNIC members and end-users in the APNIC region admin-c: HM20-AP tech-c: HM20-AP mnt-by: APNIC-HM mnt-lower: APNIC-HM changed: hm-changed at apnic.net 20020926 changed: hm-changed at apnic.net 20030207 changed: hm-changed at apnic.net 20050309 source: APNIC aut-num: AS4608 as-name: APNIC-AP descr: Asia Pacific Network Information Centre descr: Regional Internet Registry for the Asia-Pacific Region descr: 6 Cordelia Street descr: PO Box 3646 descr: South Brisbane, QLD 4101 descr: Australia country: AU admin-c: HM20-AP tech-c: NO4-AP notify: noc at apnic.net mnt-by: MAINT-APNIC-AP mnt-irt: IRT-APNIC-AP changed: hm-changed at apnic.net changed: hm-changed at apnic.net 20110309 changed: hm-changed at apnic.net 20110815 source: APNIC role: APNIC Hostmaster address: 6 Cordelia Street address: South Brisbane address: QLD 4101 country: AU phone: +61 7 3858 3100 fax-no: +61 7 3858 3199 e-mail: helpdesk at apnic.net admin-c: AMS11-AP tech-c: AH256-AP nic-hdl: HM20-AP remarks: Administrator for APNIC notify: noc at apnic.net mnt-by: MAINT-APNIC-AP changed: hm-changed at apnic.net 19981111 changed: dbmon at apnic.net 19990702 changed: hm-changed at apnic.net 20020211 changed: hm-changed at apnic.net 20070612 changed: hm-changed at apnic.net 20100217 changed: hm-changed at apnic.net 20101217 changed: hm-changed at apnic.net 20110815 source: APNIC person: APNIC Network Operations address: 6 Cordelia Street address: South Brisbane address: QLD 4101 country: AU phone: +61 7 3858 3100 fax-no: +61 7 3858 3199 e-mail: netops at apnic.net nic-hdl: NO4-AP remarks: Administrator for APNIC Network Operations notify: netops at apnic.net mnt-by: MAINT-APNIC-AP changed: netops at apnic.net 19981111 changed: hostmaster at apnic.net 20020211 changed: hm-changed at apnic.net 20081205 changed: hm-changed at apnic.net 20101217 source: APNIC $ whois AS4608 % [whois.apnic.net node-1] % Whois data copyright terms http://www.apnic.net/db/dbcopyright.html as-block: AS4608 - AS4864 descr: APNIC ASN block remarks: These AS numbers are further assigned by APNIC remarks: to APNIC members and end-users in the APNIC region admin-c: HM20-AP tech-c: HM20-AP mnt-by: APNIC-HM mnt-lower: APNIC-HM changed: hm-changed at apnic.net 20020926 changed: hm-changed at apnic.net 20030207 changed: hm-changed at apnic.net 20050309 source: APNIC <etc.> On Sat, Sep 10, 2011 at 7:26 AM, Always Learning <centos at u61.u22.net> wrote: > This works for me on Centos 5.6. It may assist newcomers to the Linux > world of Centos. > > whois 51.51.51.51 > > produces a normal and conventional display of data. > > However since ARIN, the North American registrar of IP addresses, > "modernised" its WHOIS processing, a query to > > whois 64.64.64.64 > > will produce a one line summary of possible matches, which always > includes ARIN, but omits the details we used to receive before ARIN > implemented its much criticised "improved" service. > > A one line script solves it for me (but only for ARIN network entries). > > #!/bin/bash > whois -h whois.arin.net n + $1 > > I call my script .arin > > .arin 64.64.64.64 > > produces a normal output. > > > > Paul. > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > -- Dr. Ed Morbius Chief Scientist / Philologist / Robot Wrangler / Powerplant Operator Krell Power Systems Unlimited -------------- next part -------------- An HTML attachment was scrubbed... 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