southwest.com

Checked 22 October 2026, 10:46 UTC · via 8.8.8.8
!Passed with warnings
24 passed 2 warnings 0 failed 5 info

Registration

info

.com generic · MarkMonitor Inc. · expires 2027-05-02

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
MarkMonitor Inc.
Registered
1 May 1997
Last changed
10 April 2026
Expires
2 May 2027
Status
client delete prohibited, client transfer prohibited, client update prohibited, server delete prohibited, server transfer prohibited, server update prohibited
Registry nameservers
ns-w11.southwest.com, ns-w21.southwest.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 2027-05-02 #3
    The registration is valid until 2027-05-02 (191 days).
  • ✓ Transfer locked #4
    Registry status: client delete prohibited, client transfer prohibited, client update prohibited, server delete prohibited, server transfer prohibited, server update prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

warn

ns-w11.southwest.com, ns-w21.southwest.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns-w11.southwest.com, ns-w21.southwest.com
NS in the zone
ns-w11.southwest.com, ns-w21.southwest.com
NameserverAddressesNetwork (AS)Glue
ns-w11.southwest.com66.150.1.250AS14744 INTERNAP-BLOCK-4 - Unitas Global, US66.150.1.250
ns-w21.southwest.com208.94.155.190AS29816 SWA-MKT-INET-2 - Southwest Airlines Co., US208.94.155.190

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns-w11.southwest.com, ns-w21.southwest.com.
    #6
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • ✓ Glue present and correct #8
    Glue is published for the nameservers inside the zone: ns-w11.southwest.com, ns-w21.southwest.com.
  • ✓ All names resolve #9
    Every nameserver name has an address and is not an alias.
  • ✓ Nameservers in different networks #10
    The nameservers are spread over 2 IPv4 /24s and 0 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS14744 (INTERNAP-BLOCK-4 - Unitas Global, US): 1 address; AS29816 (SWA-MKT-INET-2 - Southwest Airlines Co., US): 1 address.
  • 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

pass

2 of 2 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns-w11.southwest.com 66.150.1.250NOERROR, 125 ms, authoritativenoyes / yesrefused-
ns-w21.southwest.com 208.94.155.190NOERROR, 134 ms, authoritativenoyes / yesrefused-

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.
  • ✓ No version disclosed #17
    The nameservers don't reveal their software version.
  • ✓ 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 2020 · primary sdcscadnsgmavip.swacorp.com

Found

Primary (MNAME)
sdcscadnsgmavip.swacorp.com
Contact (RNAME)
domainrequest.wnco.com
Serial
2020
Refresh / retry
10800 s / 3600 s
Expire
2419200 s
Negative TTL
900 s

Serial per nameserver

NameserverSerial
ns-w11.southwest.com (66.150.1.250)2020
ns-w21.southwest.com (208.94.155.190)2020

Checks

  • ✓ Serial 2020 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 28d, negative TTL 15m.
  • i
    Hidden master
    The primary nameserver sdcscadnsgmavip.swacorp.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 domainrequest@wnco.com #25
    The SOA RNAME domainrequest.wnco.com means domainrequest@wnco.com.
  • ✓ Counter serial #26
    The serial 2020 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

18 records at the apex

Found

Read from
66.150.1.250:53
TypeValueTTL
SOAsdcscadnsgmavip.swacorp.com. domainrequest.wnco.com. 2020 10800 3600 2419200 900300
NSns-w11.southwest.com.300
NSns-w21.southwest.com.300
A208.94.155.99300
A66.150.1.229300
MX10 mail02.wnco.com.300
MX10 outgoing.wnco.com.300
TXT"v=spf1 include:luv.southwest.com include:spf.messagelabs.com include:cmail1.com include:amadeus.com ~all"300
TXT"pardot886213=5f9176871506272b28c41f1ddffd6a99f50aae6f7c1540d03a7e4474746e820f"300
TXT"facebook-domain-verification=5tg9b0fpw4l87zy4ga4hqxzrgjnbu7"300
TXT"tsktdktn7wq710fh3lqrrx391kfjwv0y"300
TXT"apple-domain-verification=AVqb7df_lh4ZY0IFN-xHTHCQfzRorhFBV0YJIEi3dMk"300
TXT"klaviyo-site-verification=TvuiSP"300
TXT"identrust_validate=BvULH7j+tFTCcJxzas5YCHn9MFM82G99zGdJ3Nx7OIJy"300
TXT"_4euyjhh2akthszptxyklufk2g4nm1jj"300
TXT"identrust_validate=fXNA1Qb3CuyBMtCOpRZyaKbIaisaX1CBZMlJX+K8Q2KE"300
TXT"_xpn3qn98olo03xr8hj4zxmc12tab31i"300
TXT"identrust_validate=HkfftkocT3gH5oXoFcreN5y4zrG7vLZeU9eV6GrZCrfu"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 5m, NS 5m. The NS TTL at the parent is 2d and in the zone 5m; 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