empty string -- assert nothing. bare 'none' -- assert nothing. none bare 'null' -- assert nothing. null bare 'unknown' -- assert nothing. unknown bare 'no version' -- assert nothing. no version ISC BIND: Red Hat Enterprise Linux 9.8.2rc1-RedHat-9.8.2-0.62.rc1.el6_9.2 9.9.4-RedHat-9.9.4-38.el7_3.3 9.3.6-P1-RedHat-9.3.6-25.P1.el5_11.12 9.9.1-P3-RedHat-9.9.1.P3.el6 9.9.3-rpz2+rl.13208.13-P2-RedHat-9.9.3-4.P2.el6 9.7.3-P3-RedHat-9.7.3-2.el6_1.P3.3 9.8.2rc1-RedHat-9.8.2-0.47.rc1.el6 ISC BIND: Fedora 9.10.4-P8-RedHat-9.10.4-4.P8.fc25 9.9.3-rl.13207.22-P2-RedHat-9.9.3-5.P2.fc19 9.5.2-RedHat-9.5.2-1.fc10 ISC BIND: Red Hat - Amazon hosted 9.8.2rc1-RedHat-9.8.2-0.37.rc1.45.amzn1 9.7.3-P3-RedHat-9.7.3-2.11.amzn1 ISC BIND: Red Hat - Alibaba Customized EL 9.9.9-P3-RedHat-9.9.9-2.1.alios6 9.8.2rc1-RedHat-9.8.2-0.23.rc1.2.alios6.1 ISC BIND: Red Hat nonspecific platform 9.9.10-P2-RedHat-9.9.10-P2 9.9.5-RedHat-9.9.5-1 9.8.2rc1-RedHat-9.8.2-0.10.rc1.1 ISC BIND: Ubuntu 9.9.5-11ubuntu1.1-Ubuntu 9.10.3-P4-10.1ubuntu5-Ubuntu ISC BIND: Ubuntu with Response Policy Zone and Request Limiting patches 9.9.3-rpz2+rl.13214.22-P2-Ubuntu-1:9.9.3.dfsg.P2-4ubuntu1.1 ISC BIND: Ubuntu short 9.10.3-P4-Ubuntu 9.9.5-3-Ubuntu 9.9.5-4.3-Ubuntu ISC BIND: Ubuntu Zentyal custom distribution 9.9.5-3+zentyal-Ubuntu 9.9.5-3-zentyal1-Ubuntu 9.9.3-rpz2+rl.13214.22-P2-Ubuntu-2:9.9.3.dfsg.P2-4ubuntu1.1+zentyal12 ISC BIND: Debian 10.0 (buster) 9.11.5-P4-5.1+deb10u1-Debian ISC BIND: Debian 8.0 (jessie) 9.9.5-9+deb8u11-Debian 9.9.5-9+deb8u6A~4.2.0.201702281603-Debian ISC BIND: Debian 7.0 (wheezy) 9.9.5-9wheezy1-Debian ISC BIND: Debian no version simple 9.10.3-P4-Debian 9.9.5-12.1-Debian 9.9.5-4-Debian ISC BIND: Response Policy Zone and Request Limiting patches 9.8.4-rpz2+rl005.12-P1 9.9.3-rpz2+rl.156.01-P2 ISC BIND: ESV DNS Server BIND 9.6-ESV-R7-P2 ISC BIND: bare release number - ESV REL NOESW 9.7.0-P1 9.4.2-P2.1 9.9.5-W1 9.2.2rc1 9.4.2-P2-W2 9.5.0b1 8.2.2-P5 BIND 8.2.2-P5 9.6-ESV-R11-P2 9.6.-ESV-R6 9.6-ESV 8.4.7-REL-NOESW 8.3.7-REL 8.2.2-P5-NOESW dnsmasq: simple dnsmasq-2.40 dnsmasq-2.51.2 dnsmasq-2.63rc6 dnsmasq-2.76test8 dnsmasq: Ubiquiti dnsmasq-2.76-1-ubnt2 dnsmasq: OpenDNS variant dnsmasq-2.15-OpenDNS-1 dnsmasq: no version dnsmasq-UNKNOWN dnsmasq- dnsmasq PowerDNS Recursor PowerDNS Recursor 3.6.2 (jenkins@autotest.powerdns.com built 20141031140810 mockbuild@) PowerDNS Recursor 3.7.4-rc1 (jenkins@autotest.powerdns.com built 20170120211656 root@foo-bar.foo.baz) PowerDNS Recursor: format 2 PowerDNS Recursor 4.0.4 (built Apr 13 2017 09:59:06 by root@oof-e.baz.foo.bar) PowerDNS Recursor: version only PowerDNS Recursor 4.0.4 PowerDNS Recursor 4.0.0-alpha2 PowerDNS Recursor: ID format PowerDNS Recursor 3.5.3 $Id$ PowerDNS Recursor 3.2 $Id: pdns_recursor.cc 1538 2010-03-06 11:39:03Z ahu $ PowerDNS Recursor: no version PowerDNS Recursor PowerDNS Authoritative Server PowerDNS Authoritative Server 3.4.19 (jenkins@autotest.powerdns.com built 20160102220341 root@) PowerDNS Authoritative Server 3.4.10 (jenkins@autotest.powerdns.com built 20170306160718 root@foo-bar.foo.baz) PowerDNS Authoritative Server 3.3 (jenkins@autotest.powerdns.com built 20150306160718 root@foo-bar.foo.baz) PowerDNS Authoritative Server 3.3-rc2 (jenkins@autotest.powerdns.com built 20130627120406 root@foo-bar.foo.baz) PowerDNS Authoritative Server 3.4.10 (jenkins@autotest.powerdns.com built @) PowerDNS Authoritative Server: format 2 PowerDNS Authoritative Server 4.0.4 (built Jul 26 2017 15:04:27 by root@FreeBSD:11:amd64-default-job-03) PowerDNS Authoritative Server 4.0.0-rc2 (built Jul 4 2016 15:44:39 by root@foo-bar.baz) PowerDNS Authoritative Server 4.0.0-alpha2 (built Feb 01 2016 00:12:05 by buildbot@baz) PowerDNS Authoritative Server 4.0.0-beta1 (built Feb 01 2016 00:00:00 by buildbot@baz) PowerDNS Authoritative Server 0.0.g56d692a (built Feb 25 2017 13:10:19 by root@foo-bar.baz) PowerDNS Authoritative Server 4.2.0-rc2.995.master.g8cc411dc4 (built Nov 6 2019 11:48:12 by root@foo-bar.baz) PowerDNS Authoritative Server: version only PowerDNS Authoritative Server 4.0.0 PowerDNS Authoritative Server 4.0.0-alpha2 PowerDNS: Served by format with version Served by POWERDNS 2.9.22 $Id: packethandler.cc 1321 2008-12-06 19:44:36Z ahu $ PowerDNS: Served by format without version Served by PowerDNS - https://www.powerdns.com/ Served by PowerDNS - http://www.powerdns.com Nominum Vantio CacheServe Nominum Vantio 4.3.0.2 Nominum Vantio CacheServe 7.2.1.3 Nominum Vantio CacheServe, with build Nominum Vantio 5.4.5.1 (build 114872) Nominum Vantio AuthServ Nominum ANS 5.4.0.0 Nominum ANSPremier 5.4.0.0 NLnet Labs Name Server Daemon NSD 3.2.18 NSD 4.0.0b5 NSD 4 NSD NLnet Labs Unbound unbound 1.4.22 NLnet Labs Unbound no version string unbound ISC BIND: Raspbian based on Debian Buster 9.11.5-P4-5.1+deb10u1-Raspbian ISC BIND: Raspbian based on Debian Jessie 9.9.5-9+deb8u7-Raspbian BIND 9.9.5-9+deb8u11-Raspbian ISC BIND: Raspbian based on Debian Jessie no version simple 9.10.3-P4-Raspbian Knot DNS Knot DNS 1.6.0 Knot DNS 2.5.0-dev Neustar UltraDNS Resolver UltraDNS Resolver Neustar UltraDNS TLD Platform UltraDNS TLD Platform - www.ultradns.com Microsoft DNS on Windows 2016: GA Microsoft DNS 10.0.14393 (383900CE) Microsoft DNS on Windows 2012 R2 Microsoft DNS 6.3.9600 (25804825) Microsoft DNS on Windows 2012 Microsoft DNS 6.2.9200 (23F04000) Microsoft DNS on Windows 2008 R2 Service Pack 1 Microsoft DNS 6.1.7601 (1DB15CD4) Microsoft DNS 6.1.7601 Microsoft DNS on Windows 2008 R2 Microsoft DNS 6.1.7600 (1DB04228) SPOOFED - Microsoft DNS on Windows 2008 SP something Microsoft DNS 6.0.6100 (2AEF76E) Microsoft DNS on Windows 2008 Service Pack 2 - Preview Rollup KB4489887 and later Microsoft DNS 6.0.6003 (1773501D) Microsoft DNS on Windows 2008 Service Pack 2 Microsoft DNS 6.0.6002 (17724D35) Microsoft DNS on Windows 2008 Service Pack 1 Microsoft DNS 6.0.6001 (17714726) Microsoft DNS on Windows 2003 Microsoft DNS 5.2.3790 (ECE135D) Synology DNS service DNSServer Incognito DNS Service Incognito DNS Service 6.4.4.2 (built Aug 10 2015) [up=15d30902s, ser=9876] djbdns djbdns 1.05 djbdns-1.05 DjbDNS 1.05 djbdns: no version DJBDNS djbdns rbldnsd rbldnsd 0.997a (23 Jul 2013) rbldnsd 0.996a-0.1 (01 Apr 2008) rbldnsd 0.998/WGC (31 Dec 2015) ALU (Alcatel Lucent?) DNS ALU DNS 6.2 Build 22 ALU DNS 6.2 Build 9 DrayTek DNS DraytekDNS-v1.2.3006 Ripe ATLAS Anchor Atlas Anchor 0.1 ZyWALL DNS ZyWALL DNS Array Networks SmartDNS Array SmartDNS gdnsd gdnsd OzymanDNS DNS tunnel Hi: Thu Aug 17 23:29:10 2017 Hi: Lookup=VERSION.BIND Date=Thu Aug 17 23:53:10 UTC 2017 Check Point Meta IP Meta IP DNS - BIND V8.2.7-REL (Build 31) Meta IP/DNS V4.1 - BIND V8.1.2 (Build 4704 ) CleanBrowsing DNS Server CleanBrowsing v1.5a - dns-edge-usa-west-sunnyvale-p CleanBrowsing v1.4a - dns-edge-usa-west-sunnyvale.cleanbrowsing.org dnsmasq: pi-hole dnsmasq-pi-hole-2.80 Quad9 Resolver Q9-P-6.0 Keweon DNS keweonDNS v.9.63.7201 Akamai AnswerX DNS server Version: recursive-main/22386077