Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
costargroup.com
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-23 12:00:30 UTC · ↺ Refresh
MX Hostnames
- costar-com.mail.protection.outlook.com
MX Priorities
- costar-com.mail.protection.outlook.com: 10
A / AAAA Records
- 96.16.196.22 ↩ a96-16-196-22.deploy.static.akamaitechnologies.com
Mail Server IPs
- 52.101.41.24 ↩ mail-sj0pr03cu01600.inbound.protection.outlook.com
- 40.93.192.1 ↩ mail-dm5pr02cu00201.inbound.protection.outlook.com
- 52.101.9.5 ↩ mail-mn2pr04cu00205.inbound.protection.outlook.com
- 52.101.9.2 ↩ mail-mn2pr02cu00202.inbound.protection.outlook.com
- 2a01:111:f403:f90b:: ↩ mail-bn6pr04cu00100.inbound.protection.outlook.com
- 2a01:111:f403:f909:: ↩ mail-bn6pr04cu00200.inbound.protection.outlook.com
- 2a01:111:f403:f901::1 ↩ mail-bl0pr02cu00601.inbound.protection.outlook.com
- 2a01:111:f403:c901::1 ↩ mail-bl2pr04cu00201.inbound.protection.outlook.com
SOA Record
Raw SOA
ns1.costar.com hostmaster.costar.com 2026031901 10800 3600 604800 3600
Primary NS (mname)
ns1.costar.com
Admin Email (rname)
hostmaster@costar.com
Serial
2026031901
Refresh
10800s
Retry
3600s
Expire
604800s
Minimum TTL
3600s
Nameservers (NS)
a3-65.akam.net
a9-64.akam.net
a4-66.akam.net
a1-73.akam.net
a6-67.akam.net
a22-64.akam.net
SPF Record
✓ Soft Fail (~all)
v=spf1 ip4:65.222.180.0/24 ip4:65.222.181.0/24 ip4:65.210.23.128/25 ip4:13.110.14.192/26 include:aspmx.pardot.com include:costar.com ~all
📊 DNS lookups: 2/10
~ Soft fail (~all) — moderate enforcement
DMARC Record
✓ Reject
v=DMARC1; p=reject; rua=mailto:[email protected]
✓ Reject — strongest protection
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
DKIM Selectors
✓ 2 found
selector1._domainkey
selector2._domainkey
✓ Public key: 392 chars (valid)
✓ DKIM properly configured for selector: selector1
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
39 records- google-site-verification=vxA3YbswZIECm3zk0ZwK5DZaEFlZSeHWkM-xnGyEUis
- lkuv04hudha4nlhor7b5g1sns1
- google-site-verification=dRMsB1RC0cZarJwtKKsXh6ti0_dI0jfiKBWR6rlKW9I
- 71p3NPXWOL+y+a3rw/uwq28LXg/yeIP/Unt06U+MGGxM+xIsxXlc0haY01eHc7FLXPfIMl1p4hKBHDVaM507Ew==
- knowbe4-site-verification=f260d28316f3a7f096abacd939b0359a
- jamf-site-verification=hTMAN8Ie4Ds73pFrylOSag
- gd3bkltt9g8ede1ukcfmoiifap
- onetrust-domain-verification=31555b6cbd8c424dbc2af4c6b7778ca1
- apple-domain-verification=bA9kJcDCPYOxVKIT
- pd74e490gla4afbguhubh7vfql
- pendo-domain-verification=82c7d765-3228-4d99-8d75-b8f2cc346b81
- adobe-idp-site-verification=24664704b6bf9cad007ee8e4e6f54db759418404868491369b399f373520defd
- ZOOM_verify_ak5qkIScRcZyYiuu6lNsT9
- google-site-verification=LPmcDCTaruDoiRydPycrWM-gwHTpx-pOQVani_Q3_Rw
- _u4ftpvil2wit6whh9wdjbqagjqfztmf
- _2j4f57rzo6nut1kznqclkbmwmiyhqw2
- google-site-verification=6UOGg_Z2xf-dD8m0uAZHK5znfS2PFxkBDwHi-cTi71o
- figma-domain-verification=8232118525ac89d71aa3f807657ba9e5e26cfa8f711f2e3144c4c5c7fc2aec1e-1734372308
- 389adqsm6edioaci1vt55v9f8n
- SPFv=spf1 ip4:65.222.180.0/24 ip4:65.222.181.0/24 ip4:65.210.23.128/25 ip4:13.110.14.192/26 include:aspmx.pardot.com include:costar.com ~all
- atlassian-sending-domain-verification=fdb04715-1be1-4a1d-888e-4b6a0b8a909a
- citrix-verification-code=42c6f62f-b974-4c3a-b70a-6428068290db
- google-site-verification=gObUXI6kgmQFY2qkOL1__rC16aHh3vRJSM_GV-BechU
- onetrust-domain-verification=f2de7d399c1241499a499fdc0558446f
- _tdkq9tvjbh9k2bl3z6dydxibfcvk0nh
- citrix-verification-code=c8992f87-272c-436a-bd74-1893318d7fe1
- openai-domain-verification=dv-tUqaPuiis4BZWYSb7ZaaOLpl
- docker-verification=e860767a-e100-4f51-ac8d-65432b5a2d9e
- google-site-verification=2_1IKZPRNTtQvHOHLt2y0vH_trKWDbSABldeSHpHUfs
- google-site-verification=EAZX2N15nAq9RxAX87hFGWVMXw5VgoeSOTZa0zJ4ogc
- atlassian-domain-verification=LAkz2FUxxMo9oBp9qlpKyMPkFQT3p7fXn2F/dz0S07Gt8LASUog19dNicOe7njFJ
- SFMC-OZC-0eAv-p0AIi0DQ5RG11mv9F5FWzhSzerfVY3-
- segment-site-verification=ANCDO32VsampC7rGoR88pHhGxRUw4GKh
- i8osjkj7ji8v8ae7j587k21vjj
- MS=ms75226650
- facebook-domain-verification=e9tibbxg48pgvnj03avnmaf5lzem2d
- i7u00rtfqpkbqcpu943v4a00sj
- google-site-verification=-un5yT_panyd9dePo-LC2_E-FrcYZZyeyl1WoX8IFks
- canva-site-verification=J2uxGLoanK0eQmOQJjakyg
Free · No signup required
Add email validation to your forms
Block disposable emails, validate MX records, detect role accounts — unlimited, forever free.
<script src="https://check.verifyswift.com/"></script>
One line of code · Works on any site
See demo & docs
Deep verification
Full email verification for costargroup.com
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits