nrc.gov

Valid Email Server
Domain Lookup › nrc.gov

Domain Overview

DNS: ✓ 2mo ago Checker: ✓ 2mo ago
nrc.gov
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Did you mean: [email protected]

Checked via [email protected] · 2026-04-01 14:14:13 UTC · ↺ Refresh

MX Hostnames

  • mail5.nrc.gov
  • r4mail2.nrc.gov
  • mail4.nrc.gov
  • r4mail1.nrc.gov

MX Priorities

  • r4mail2.nrc.gov: 10
  • mail4.nrc.gov: 10
  • mail5.nrc.gov: 10
  • r4mail1.nrc.gov: 10

A / AAAA Records

  • 148.184.180.35 ↩ nrc.gov

Mail Server IPs

  • 148.184.230.43 ↩ r4mail2.nrc.gov
  • 148.184.180.41 ↩ mail4.nrc.gov
  • 148.184.180.45 ↩ mail5.nrc.gov
  • 148.184.230.45 ↩ r4mail1.nrc.gov

SOA Record

Raw SOA a18-65.akam.net postmaster.nrc.gov 2025115293 10800 1080 2419200 900
Primary NS (mname)
a18-65.akam.net
Admin Email (rname)
postmaster@nrc.gov
Serial
2025115293
Refresh
10800s
Retry
1080s
Expire
2419200s
Minimum TTL
900s

Nameservers (NS)

ns0132.secondary.cloudflare.com
ns0036.secondary.cloudflare.com
a18-65.akam.net
a8-65.akam.net
a3-67.akam.net

SPF Record

✓ Strict (-all)
v=spf1 ip4:148.184.176.0/24 ip4:148.184.230.0/24 ip4:148.184.179.0/24 ip4:148.184.180.0/24 ip4:148.184.231.25 -all
📊 DNS lookups: 0/10
✓ Hard fail (-all) — strict enforcement

DMARC Record

✓ Reject
v=DMARC1; p=reject; pct=100; rua=mailto:[email protected]; ruf=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: 216 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

11 records
  • cloudflare_dashboard_sso=bcaf9540a30612b1c22367755145941d
  • openai-domain-verification=dv-dXKnNcRdWiRhUEJuwutwuCBK
  • domain-verification=aftIcKeXgQOvVC-V-8W97iyy7La0cyY1d9bUoyLbepg
  • MS=ms97771157
  • _j4w1bxhrpdagb2e3meaaf20mrzymomv
  • identrust_validate=46GtRVn6sZ25pMCvgN7Sf58oxv00fh4m065o49U19esP
  • docusign=1462ecf3-011c-4738-b1e0-57db57790a7b
  • SPFv=spf1 ip4:148.184.176.0/24 ip4:148.184.230.0/24 ip4:148.184.179.0/24 ip4:148.184.180.0/24 ip4:148.184.231.25 -all
  • google-site-verification=ViHe5l7h-Y_ZVr7Glpo6LrgehWYSTY2gT2R85IWPj4I
  • box-domain-verification=188d55b7f9bc574046e7967ec392d5695e2782dfd9cd73214eef3219cdd47807
  • apple-domain-verification=UHb4ziZa9mhVGGpv
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