Domain Intelligence Report

si.edu

Compare

Lineage

Jan 6, 2009 → Oct 31, 2026

Registry record since 2025 · 0 renewals on record.

Registrar
15 snapshots
Nameservers
seen in WHOIS
si.edusi.eduAkamaiDNS moved to Akamaibetween Aug 31, 2022 and Sep 8, 2022si-names1.si.edu, si-names2.si.edu → a1-88.akam.net, a11-67.akam.net, a24-67.akam.net, a26-66.akam.net, a28-65.akam.net, a9-64.akam.net. Old set last seen in WHOIS on 2022-08-31; new set first seen in WHOIS on 2022-09-08.
2013201720212026
What changed
  1. DNS moved to Akamai between Aug 31, 2022 and Sep 8, 2022si-names1.si.edu, si-names2.si.edu → a1-88.akam.net, a11-67.akam.net, a24-67.akam.net, a26-66.akam.net, a28-65.akam.net, a9-64.akam.net. Old set last seen in WHOIS on 2022-08-31; new set first seen in WHOIS on 2022-09-08.

Registrar and renewals: 15 WHOIS/RDAP snapshots, 2025-01-14 to 2025-05-01 (ledger built 2026-09-27). Every renewal

Nameservers, WHOIS snapshots: 450 WHOIS/RDAP snapshots that listed nameservers, 2009-01-06 to 2026-06-12 (who.is archive). A change is placed between the nearest observations on either side, from whichever source made them; where the two sources disagree, both are shown.

Hatched = the span we hold records for. A coloured bar runs only between observations that named the same registrar or operator; nothing is assumed in between.

Each mark sits at the first observation of the new state; its bracket runs back to the last observation of the old one.

Gathering intelligence... (11/12)
DNS
WHOIS
Security
Email
DNSSEC
Threats
Deliverability
SSL/TLS
HTTP
Tech Stack
Subdomains
Archive
Outline
DNS
1 A · 1 MX · 6 NS · 9 CAA · 1 PTR · 1 SOA · 65 TXT
SSL/TLS
Sectigo Limited · TLSv1.3 · expires in 131d · 2 SANs
Email Auth
SPF ✓ · DKIM ✓ · DMARC ✓ (p=reject)
DNSSEC
signed · valid chain of trust
Tech Stack
Host: Smithsonian Institution · Email: Microsoft 365 · Cloudflare
HTTP
1 redirect → 403 · HSTS ✓ · CSP ✗ · X-Frame ✓ · Nosniff ✓
Security
B (160/205) · 1 high
Threats
risk: medium
Deliverability
A+ (96/100) · 1 MX · 8 IPs · 1 issue(s)
Subdomains
2 found · 71 answered (41 timed out) — m, www
Web Archive
first snapshot 1997-05-02 · 29y archived
DNS Recordschecked 1.4d ago
Details
1 A · 1 MX · 6 NS · 9 CAA · 1 PTR · 1 SOA · 65 TXT
WHOIS
Then vs Nownew
Details
Not enough evidence to say whether this is still the same organisation.
Now: Education or reference
AI-judged Sep 30, 2026: likely, not verified
SSL/TLSchecked 1.4d ago
Details
Valid certificate
Issuer: Sectigo Limited
Protocol: TLSv1.3
Expires in 131 days
2 SAN(s)
Securitychecked 1.4d ago
Details
B
160/205
1 high1 medium
Weakest: Basic Security, Advanced Security
Email Authchecked 1.4d ago
Details
SPFDKIMDMARC
Policy: reject
DNSSECchecked 1.4d ago
Details
Valid chain of trust
Tech Stackchecked 1.4d ago
Details
Smithsonian InstitutionCloudflareEmail: Microsoft 365Google Search ConsoleApple BusinessAtlassianDocuSign
HTTP / Headerschecked 1.4d ago
Details
1 redirect(s) → 403
HSTSCSPX-FrameNosniff
Threatschecked 1.4d ago
Details
Risk: medium · score 0.6999999999999998
Zone census
Subdomainschecked 1.4d ago
Details
2 found · 71 answered · 41 timed out (unknown)
Click a subdomain for its full report
Web Archivechecked 1.4d ago
Details
First archived: 1997-05-02
~29 years of history
Deliverabilitychecked 1.4d ago
Details
A+
96/100 · 1 issue(s)
1 MX · 8 IP(s)

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