Hi Christoffer, Thanks for the detailed response and it means if the source is not RIPE then it shouldn’t be considered as authentic data because the resource belongs to RIPE NCC. As posted earlier the resource in question is <a href="http://188.64.224.0/21">188.64.224.0/21</a> which doesn’t result anything from default source i.e RIPE. <div class="gmail_quote"><div dir="ltr">On Thu, 12 Jul 2018 at 6:20 pm, Christoffer Hansen <<a href="mailto:netravnen@gmail.com">netravnen@gmail.com</a>> wrote: </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Thu, 12 Jul 2018 at 11:24, Aftab Siddiqui via db-wg <<a href="mailto:db-wg@ripe.net" target="_blank">db-wg@ripe.net</a>> wrote: > I would like to understand the difference between these 2 results for the same prefix. > > Source: GRS > <a href="https://apps.db.ripe.net/db-web-ui/#/query?bflag=true&source=GRS&searchtext=188.64.224.0%2F21%23resultsSection" rel="noreferrer" target="_blank">https://apps.db.ripe.net/db-web-ui/#/query?bflag=true&source=GRS&searchtext=188.64.224.0%2F21#resultsSection</a> ~ > whois --host <a href="http://whois.ripe.net" rel="noreferrer" target="_blank">whois.ripe.net</a> -rB --resource <a href="http://188.64.224.0/21" rel="noreferrer" target="_blank">188.64.224.0/21</a> | grep -ve '^[[:space:]]*$' | grep -ve '^[% ]' | grep -v 'remarks:' route: <a href="http://188.64.224.0/21" rel="noreferrer" target="_blank">188.64.224.0/21</a> descr: Twitter Route origin: AS13414 notify: <a href="mailto:noc@twitter.com" target="_blank">noc@twitter.com</a> mnt-by: MAINT-AS13414 source: RADB-GRS Note the "--resource" parameter being present. Which will include results from other(!) databases apart from the RIPE NCC database. In this case the RADB-GRS database. The 'source:' also denote this fact. Nb: You can see <a href="http://www.irr.net/docs/list.html#RIPE" rel="noreferrer" target="_blank">http://www.irr.net/docs/list.html#RIPE</a> which other RIR databases the RIPE NCC mirrors. > Source: RIPE > <a href="https://apps.db.ripe.net/db-web-ui/#/query?bflag&searchtext=188.64.224.0%2F21&source=RIPE%23resultsSection" rel="noreferrer" target="_blank">https://apps.db.ripe.net/db-web-ui/#/query?bflag&searchtext=188.64.224.0%2F21&source=RIPE#resultsSection</a> ~ > whois -h <a href="http://whois.ripe.net" rel="noreferrer" target="_blank">whois.ripe.net</a> -rB <a href="http://188.64.224.0/21" rel="noreferrer" target="_blank">188.64.224.0/21</a> | grep -ve '^[[:space:]]*$' | grep -ve '^[% ]' | grep -v 'remarks:' inetnum: 188.0.0.0 - 188.255.255.255 netname: EU-ZZ-188 descr: To determine the registration information for a more descr: specific range, please try a more specific query. descr: If you see this object as a result of a single IP query, descr: it means the IP address is currently in the free pool of descr: address space managed by the RIPE NCC. country: EU # Country is in fact world wide admin-c: IANA1-RIPE tech-c: IANA1-RIPE status: ALLOCATED UNSPECIFIED mnt-by: RIPE-NCC-HM-MNT created: 2002-04-08T12:41:20Z last-modified: 2015-09-23T13:18:27Z source: RIPE By default only results from the RIPE NCC database is included. </blockquote></div>