stephenwolfram.com

Checked 22 October 2026, 10:51 UTC · via 8.8.8.8
!Passed with warnings
21 passed 3 warnings 0 failed 7 info

Registration

info

.com generic · GoDaddy Corporate Domains, LLC · expires 2027-10-04

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
GoDaddy Corporate Domains, LLC
Registered
5 October 1998
Last changed
3 September 2026
Expires
4 October 2027
Status
client transfer prohibited
Registry nameservers
wri-dns2.wolfram.com, wri-dns3.wolfram.com
RDAP server
https://rdap.verisign.com/com/v1/

Checks

  • i
    .com is a generic TLD (gTLD)
    Generic TLD under an ICANN registry agreement: ICANN-accredited registrars, UDRP and RDAP apply.
    #1
  • ✓ TLD delegated and signed #2
    .com is delegated in the root zone and DNSSEC-signed.
  • ✓ Expires on 2027-10-04 #3
    The registration is valid until 2027-10-04 (346 days).
  • ✓ Transfer locked #4
    Registry status: client transfer prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

warn

wri-dns2.wolfram.com, wri-dns3.wolfram.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
wri-dns2.wolfram.com, wri-dns3.wolfram.com
NS in the zone
wri-dns2.wolfram.com, wri-dns3.wolfram.com
NameserverAddressesNetwork (AS)Glue
wri-dns2.wolfram.com140.177.10.23AS11106 WOLFRAM-AS - Wolfram Research, Inc., US140.177.10.23
wri-dns3.wolfram.com140.177.10.19AS11106 WOLFRAM-AS - Wolfram Research, Inc., US140.177.10.19

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: wri-dns2.wolfram.com, wri-dns3.wolfram.com.
    #6
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • ✓ No glue needed #8
    All nameservers are outside the zone, so no glue records are needed.
  • ✓ All names resolve #9
    Every nameserver name has an address and is not an alias.
  • !
    Nameservers in one network
    all IPv4 addresses are in 140.177.10.0/24. A single network failure takes all nameservers down; RFC 2182 recommends topologically separate networks (anycast setups are an exception).
    #10
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS11106 (WOLFRAM-AS - Wolfram Research, Inc., US): 2 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.
    #11
  • i
    All nameserver names under .com
    All nameserver names are under one TLD, so a problem with that TLD also makes the nameservers unreachable. Some operators use names under two TLDs for extra resilience.
    #12
  • !
    No IPv6
    None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.
    #13

Nameservers

info

2 of 2 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
wri-dns2.wolfram.com 140.177.10.23NOERROR, 109 ms, authoritativenoyes / yesrefusedNot a chance
wri-dns3.wolfram.com 140.177.10.19NOERROR, 109 ms, authoritativenoyes / yesrefusedNot a chance

Checks

  • ✓ All respond #14
    All 2 nameserver addresses answered.
  • ✓ All authoritative #15
    Every responding nameserver answers authoritatively for the zone.
  • ✓ No recursion #16
    The nameservers do not answer recursive queries for other domains.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: wri-dns2.wolfram.com: "Not a chance"; wri-dns3.wolfram.com: "Not a chance".
    #17
  • ✓ Zone transfers refused #18
    No nameserver allows a zone transfer to the public.
  • ✓ TCP supported #19
    All nameservers answer over TCP.
  • ✓ EDNS supported #20
    All nameservers support EDNS(0).
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

info

serial 10151 · primary stephenwolfram.com

Found

Primary (MNAME)
stephenwolfram.com
Contact (RNAME)
postmaster.wolfram.com
Serial
10151
Refresh / retry
86400 s / 21600 s
Expire
604800 s
Negative TTL
50400 s

Serial per nameserver

NameserverSerial
wri-dns2.wolfram.com (140.177.10.23)10151
wri-dns3.wolfram.com (140.177.10.19)10151

Checks

  • ✓ Serial 10151 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1d, retry 6h, expire 7d, negative TTL 14h.
  • i
    Hidden master
    The primary nameserver stephenwolfram.com is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.
    #24
  • ✓ Contact postmaster@wolfram.com #25
    The SOA RNAME postmaster.wolfram.com means postmaster@wolfram.com.
  • ✓ Counter serial #26
    The serial 10151 is a plain counter.

DNSSEC

warn

Not signed

Found

Validated by resolver
no

Checks

  • !
    Not signed
    The zone is not signed with DNSSEC, so answers can be spoofed. Enable DNSSEC at your DNS provider and publish the DS record at your registrar.
    #27

Records

info

9 records at the apex

Found

Read from
140.177.10.23:53
TypeValueTTL
SOAstephenwolfram.com. postmaster.wolfram.com. 10151 86400 21600 604800 5040086400
NSwri-dns2.wolfram.com.86400
NSwri-dns3.wolfram.com.86400
A140.177.52.20086400
MX10 mx1.wolfram.com.86400
MX10 mx2.wolfram.com.86400
TXT"8jqr6vspa09pi098u95jlgmt27"86400
TXT"d8d78go8n9bj6925392pleg1qr"86400
TXT"v=spf1 include:wolfram.com -all"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 1d, MX 1d, NS 1d. The NS TTL at the parent is 2d and in the zone 1d; resolvers may use either.
  • ✓ No CNAME at the apex #33
    The zone apex has no CNAME record.
  • ✓ No wildcard #34
    Names that don't exist return NXDOMAIN.
  • i
    No CAA records
    Without CAA records any certificate authority may issue certificates for this domain. A CAA record limits issuance to the CAs you use.
    #35