presonus.com

Checked 22 October 2026, 10:21 UTC · via 8.8.8.8
✗Problems found
22 passed 4 warnings 2 failed 3 info

Registration

info

.com generic · Network Solutions, LLC · expires 2030-08-29

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Network Solutions, LLC
Registered
30 August 1995
Last changed
30 June 2025
Expires
29 August 2030
Status
client transfer prohibited
Registry nameservers
ns-1459.awsdns-54.org, ns-1547.awsdns-01.co.uk, ns-194.awsdns-24.com, ns-521.awsdns-01.net, ns-839.awsdns-40.net
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 2030-08-29 #3
    The registration is valid until 2030-08-29 (1406 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

ns-1459.awsdns-54.org, ns-1547.awsdns-01.co.uk, ns-194.awsdns-24.com, ns-521.awsdns-01.net, ns-839.awsdns-40.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns-1459.awsdns-54.org, ns-1547.awsdns-01.co.uk, ns-194.awsdns-24.com, ns-521.awsdns-01.net, ns-839.awsdns-40.net
NS in the zone
ns-1459.awsdns-54.org, ns-1547.awsdns-01.co.uk, ns-194.awsdns-24.com, ns-839.awsdns-40.net
NameserverAddressesNetwork (AS)Glue
ns-1459.awsdns-54.org205.251.197.179 2600:9000:5305:b300::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-1547.awsdns-01.co.uk205.251.198.11 2600:9000:5306:b00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-194.awsdns-24.com205.251.192.194 2600:9000:5300:c200::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US205.251.192.194 2600:9000:5300:c200::1
ns-521.awsdns-01.net (parent only)205.251.194.9 2600:9000:5302:900::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-839.awsdns-40.net205.251.195.71 2600:9000:5303:4700::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-

Checks

  • ✓ 5 nameservers #6
    Delegated to ns-1459.awsdns-54.org, ns-1547.awsdns-01.co.uk, ns-194.awsdns-24.com, ns-521.awsdns-01.net, ns-839.awsdns-40.net.
  • !
    NS sets differ
    The nameservers at the parent and in the zone should be the same. Only at the parent: ns-521.awsdns-01.net. ns-1459.awsdns-54.org, ns-1547.awsdns-01.co.uk, ns-194.awsdns-24.com, ns-839.awsdns-40.net report NS ns-1459.awsdns-54.org ns-1547.awsdns-01.co.uk ns-194.awsdns-24.com ns-839.awsdns-40.net.
    #7
  • ✓ 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 different networks #10
    The nameservers are spread over 5 IPv4 /24s and 5 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS16509 (AMAZON-02 - Amazon.com, Inc., US): 10 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.
    #11
  • ✓ Nameserver names under 4 TLDs #12
    Nameserver names use the TLDs .com, .net, .org, .uk.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

fail

8 of 10 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns-1459.awsdns-54.org 205.251.197.179NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns-1459.awsdns-54.org 2600:9000:5305:b300::1NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-1547.awsdns-01.co.uk 205.251.198.11NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-1547.awsdns-01.co.uk 2600:9000:5306:b00::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-194.awsdns-24.com 205.251.192.194NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-194.awsdns-24.com 2600:9000:5300:c200::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-521.awsdns-01.net 205.251.194.9REFUSED, 4 ms, NOT authoritativenono / norefused-
ns-521.awsdns-01.net 2600:9000:5302:900::1REFUSED, 4 ms, NOT authoritativenono / norefused-
ns-839.awsdns-40.net 205.251.195.71NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns-839.awsdns-40.net 2600:9000:5303:4700::1NOERROR, 4 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 10 nameserver addresses answered.
  • ✗
    Lame delegation
    These nameservers don't answer authoritatively for the zone, so resolvers ignore them: ns-521.awsdns-01.net (205.251.194.9): REFUSED, authoritative=false; ns-521.awsdns-01.net (2600:9000:5302:900::1): REFUSED, authoritative=false.
    #15
  • ✓ 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.
  • ✗
    No DNS over TCP
    DNS over TCP is required (RFC 7766); without it, large answers such as DNSSEC responses fail. Not answering over TCP: ns-521.awsdns-01.net (205.251.194.9): ; ns-521.awsdns-01.net (2600:9000:5302:900::1): .
    #19
  • !
    No EDNS
    These nameservers don't support EDNS(0), needed for DNSSEC and answers larger than 512 bytes: ns-521.awsdns-01.net (205.251.194.9), ns-521.awsdns-01.net (2600:9000:5302:900::1).
    #20
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

pass

serial 1 · primary ns-1459.awsdns-54.org

Found

Primary (MNAME)
ns-1459.awsdns-54.org
Contact (RNAME)
awsdns-hostmaster.amazon.com
Serial
1
Refresh / retry
7200 s / 900 s
Expire
1209600 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns-1459.awsdns-54.org (205.251.197.179)1
ns-1459.awsdns-54.org (2600:9000:5305:b300::1)1
ns-1547.awsdns-01.co.uk (205.251.198.11)1
ns-1547.awsdns-01.co.uk (2600:9000:5306:b00::1)1
ns-194.awsdns-24.com (205.251.192.194)1
ns-194.awsdns-24.com (2600:9000:5300:c200::1)1
ns-839.awsdns-40.net (205.251.195.71)1
ns-839.awsdns-40.net (2600:9000:5303:4700::1)1

Checks

  • ✓ Serial 1 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 2h, retry 15m, expire 14d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns-1459.awsdns-54.org is one of the listed nameservers.
  • ✓ Contact awsdns-hostmaster@amazon.com #25
    The SOA RNAME awsdns-hostmaster.amazon.com means awsdns-hostmaster@amazon.com.
  • ✓ Counter serial #26
    The serial 1 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

warn

19 records at the apex

Found

Read from
205.251.197.179:53
TypeValueTTL
SOAns-1459.awsdns-54.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400900
NSns-1459.awsdns-54.org.172800
NSns-1547.awsdns-01.co.uk.172800
NSns-194.awsdns-24.com.172800
NSns-839.awsdns-40.net.172800
A23.227.38.6560
MX10 us-smtp-inbound-1.mimecast.com.7200
MX10 us-smtp-inbound-2.mimecast.com.7200
TXT"0ed1fe018a36ba1c8890d14d28b69a07440aeac2e3"300
TXT"MS=ms25107841"300
TXT"_537kedsp5hp0jccao8znn4fvgbdk3k3"300
TXT"b32dbuio0vn4r2ju040ms1hdsv"300
TXT"ca3-e028abe3b7cb40aeb1b4e83d09e7feae"300
TXT"google-site-verification=-BG8dSbtdyKKlMvrvwiD4T7XLoE_F66nl0LggkM0vsU"300
TXT"google-site-verification=vgKqKlJUpfM4ftdO5ZD4GkIIDFrGZzguiuJtXNAyio4"300
TXT"knowbe4-site-verification=5da560db6da4e6f24436823c0af7436c"300
TXT"ongde5bdhegaqntm8lg0uacq4m"300
TXT"stripe-verification=6fe1f0b16112a3e135319017e6002d143087f93b67e7c030aca87d2e8a31fa3d"300
TXT"v=spf1 ip4:3.89.253.228 ip4:89.107.185.250 ip4:18.215.243.16 ip4:3.88.130.235 ip4:216.27.63.0/24 ip4:69.166.148.0/24 include:us._netblocks.mimecast.com ip4:69.166.157.0/24 include:_spf.google.com a:production.web.fmic.demandware.net ~all"300

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (1m). Low TTLs are useful just before a planned change.
    #32
  • ✓ 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