Email Domain Lookup

Browse our comprehensive directory of popular email domains with detailed MX records, SPF, DKIM, DMARC authentication data, and mail server information. Research any domain before sending.

2,731 Domains Indexed
SPF, DKIM, DMARC Checks
MX Record Analysis
All (2,731) Freemail (200) Disposable (589) Corporate (1,134) Government (113) Education (431) Isp (264)
Domain ▼ Type Organization Mail Server Status
optusnet.com.au freemail Optus Australia atmailcloud.com Active View
optus.com.au isp Optus fireeyecloud.com Active View
optonline.net isp Altice USA / Optimum openwave.ai Active View
optimum.net isp Altice USA openwave.ai Active View
optimizely.com corporate Optimizely Inc. Mimecast Active View
oppo.com corporate OPPO Electronics Microsoft 365 Active View
opm.gov government Office of Personnel Management Microsoft 365 Active View
opentext.com corporate OpenText Corporation Proofpoint Active View
opendoor.com corporate Opendoor Technologies Proofpoint Active View
op.pl freemail Onet Poczta onet.pl Active View
ooredoo.com corporate Ooredoo Group ooredoo.qa Active View
oopi.org disposable — oopi.org Active View
onsemi.com corporate ON Semiconductor Mimecast Active View
ono.com isp ONO None Inactive View
online.nl isp Online.nl capitar.com Active View
onewaymail.com disposable — None Active View
onet.pl freemail Ringier Axel Springer Poland onet.pl Active View
oneok.com corporate ONEOK Proofpoint Active View
oneoffemail.com disposable — Microsoft 365 Active View
one.lt freemail UAB Cgates Lithuania one.lt Active View
one-time.email disposable — None Active View
omron.com corporate Omron Corporation Microsoft 365 Active View
omnicomgroup.com corporate Omnicom Group Microsoft 365 Active View
olin.edu education Olin College of Engineering Microsoft 365 Active View
olddominionfreight.com corporate Old Dominion Freight Line Self-hosted Active View
okta.com corporate Okta Inc. Proofpoint Active View
okstate.edu education Oklahoma State University Microsoft 365 Active View
oit.edu education Oregon Institute of Technology Microsoft 365 Active View
oi.com.br isp Oi Telecomunicacoes com.br Active View
ohio.gov government State of Ohio Microsoft 365 Active View
ohio.edu education Ohio University Microsoft 365 Active View
ogilvy.com corporate Ogilvy Proofpoint Active View
oge.com corporate OGE Energy Microsoft 365 Active View
odu.edu education Old Dominion University Microsoft 365 Active View
odn.ne.jp isp ODN (Japan Telecom) trendmicro.com Active View
ocn.ne.jp isp OCN (NTT Communications) bizmw.com Active View
ochsner.org corporate Ochsner Health Microsoft 365 Active View
oceanspray.com corporate Ocean Spray Cranberries Microsoft 365 Active View
obobbo.com disposable — None Active View
objectmail.com disposable — trashmail.com Active View
oakton.edu education Oakton College Google Workspace Active View
o2online.de isp O2 Germany o2online.de Active View
o2.pl freemail Grupa Pracuj tlen.pl Active View
o2.co.uk isp O2 / Virgin Media None Active View
nyulangone.org corporate NYU Langone Health Proofpoint Active View
nyu.edu education New York University Proofpoint Active View
nytimes.com corporate The New York Times Google Workspace Active View
nyse.com corporate New York Stock Exchange Proofpoint Active View
ny.gov government State of New York Microsoft 365 Active View
nxp.com corporate NXP Semiconductors Microsoft 365 Active View

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