Public DNS Servers Google: Google FAQ 8.8.8.8 8.8.4.4 Level 3 : 4.2.2.2 4.2.2.1 The new kid on the block is Cloudflare 1.1.1.1 1.0.0.1 https://mozilla.cloudflare-dns.com/ https://developers.cloudflare.com/1.1.1.1/dns-over-https/json-format/
IPdeny country block downloads All country IP block files are provided in CIDR format, at this time. Please note that we compile these lists from regional IP space providers. To correct any errors please contact your local IP space provider e.g. for Europe it’s Ripe, for North America it’s Arin. http://www.ipdeny.com/ipblocks/
ISP SMTP Server Adelphia smtp.blk.adelphia.net Alltel mail.alltel.net AOL smtp.aol.com AT&T mailhost.worldnet.att.net AT&T Business Internet Service mail.attbi.com BCPL mail.bcpl.net bellatlantic.net smtpout.bellatlantic.net Bestweb smtp.bestweb.net BEV.net smtp.bev.net Blacksburg.net smtp.blacksburg.net BYU nm.byu.edu CalWeb smtp.calweb.com Charm.net smtp.charm.net Charter Communications smtp.charter.net chicagonet.net mail.chicagonet.net Citizen’s Internet smtp.swva.net Coastalnet mail2.coastalnet.com Columbia smtp.columbia.edu Comcast smtp.comcast.net Comcast / ATTBI smtp.comcast.net CompuServ smtp.site1.csi.com CompuServe Classic mail.compuserve.com
Excerpt New Referral Behavior When queried for an existing A or AAAA record serving as glue (an address record at or below NS records at a delegation point), the authoritative name servers for .com and .net respond with the glue record in the answer section. However, the answer is not marked authoritative, i.e., the AA
dig com. ns DNS Root Servers 274683 IN NS I.ROOT-SERVERS.NET. . 274683 IN NS J.ROOT-SERVERS.NET. . 274683 IN NS K.ROOT-SERVERS.NET. . 274683 IN NS L.ROOT-SERVERS.NET. . 274683 IN NS M.ROOT-SERVERS.NET. . 274683 IN NS A.ROOT-SERVERS.NET. . 274683 IN NS B.ROOT-SERVERS.NET. . 274683 IN NS C.ROOT-SERVERS.NET. . 274683 IN NS D.ROOT-SERVERS.NET. . 274683 IN NS E.ROOT-SERVERS.NET.
