survio.com

Checked 22 October 2026, 10:53 UTC · via 8.8.8.8
!Passed with warnings
24 passed 3 warnings 0 failed 4 info

Registration

info

.com generic · CSL Computer Service Langenbach GmbH d/b/a joker.com · expires 2030-03-12

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
CSL Computer Service Langenbach GmbH d/b/a joker.com
Registered
12 March 2003
Last changed
3 August 2026
Expires
12 March 2030
Status
client transfer prohibited
Registry nameservers
gail.ns.cloudflare.com, guy.ns.cloudflare.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 2030-03-12 #3
    The registration is valid until 2030-03-12 (1237 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

info

gail.ns.cloudflare.com, guy.ns.cloudflare.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
gail.ns.cloudflare.com, guy.ns.cloudflare.com
NS in the zone
gail.ns.cloudflare.com, guy.ns.cloudflare.com
NameserverAddressesNetwork (AS)Glue
gail.ns.cloudflare.com172.64.32.116 173.245.58.116 108.162.192.116 2803:f800:50::6ca2:c074 2a06:98c1:50::ac40:2074 2606:4700:50::adf5:3a74AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US108.162.192.116 172.64.32.116 173.245.58.116 2606:4700:50::adf5:3a74 2803:f800:50::6ca2:c074 2a06:98c1:50::ac40:2074
guy.ns.cloudflare.com172.64.33.173 173.245.59.173 108.162.193.173 2a06:98c1:50::ac40:21ad 2803:f800:50::6ca2:c1ad 2606:4700:58::adf5:3badAS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US108.162.193.173 172.64.33.173 173.245.59.173 2606:4700:58::adf5:3bad 2803:f800:50::6ca2:c1ad 2a06:98c1:50::ac40:21ad

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: gail.ns.cloudflare.com, guy.ns.cloudflare.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 different networks #10
    The nameservers are spread over 6 IPv4 /24s and 4 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS13335 (CLOUDFLARENET - Cloudflare, Inc., US): 12 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
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

warn

12 of 12 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
gail.ns.cloudflare.com 172.64.32.116NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
gail.ns.cloudflare.com 173.245.58.116NOERROR, 4 ms, authoritativenoyes / yesrefused2026.10.2
gail.ns.cloudflare.com 108.162.192.116NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
gail.ns.cloudflare.com 2803:f800:50::6ca2:c074NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
gail.ns.cloudflare.com 2a06:98c1:50::ac40:2074NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
gail.ns.cloudflare.com 2606:4700:50::adf5:3a74NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
guy.ns.cloudflare.com 172.64.33.173NOERROR, 6 ms, authoritativenoyes / yesrefused2026.10.2
guy.ns.cloudflare.com 173.245.59.173NOERROR, 4 ms, authoritativenoyes / yesrefused2026.10.2
guy.ns.cloudflare.com 108.162.193.173NOERROR, 7 ms, authoritativenoyes / yesrefused2026.10.2
guy.ns.cloudflare.com 2a06:98c1:50::ac40:21adNOERROR, 6 ms, authoritativenoyes / yesrefused2026.10.2
guy.ns.cloudflare.com 2803:f800:50::6ca2:c1adNOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
guy.ns.cloudflare.com 2606:4700:58::adf5:3badNOERROR, 6 ms, authoritativenoyes / yesrefused2026.10.2

Checks

  • ✓ All respond #14
    All 12 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.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: gail.ns.cloudflare.com: "2026.10.2"; guy.ns.cloudflare.com: "2026.10.2". Hide or replace the version string.
    #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

pass

serial 2416412470 · primary gail.ns.cloudflare.com

Found

Primary (MNAME)
gail.ns.cloudflare.com
Contact (RNAME)
dns.cloudflare.com
Serial
2416412470
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
gail.ns.cloudflare.com (172.64.32.116)2416412470
gail.ns.cloudflare.com (173.245.58.116)2416412470
gail.ns.cloudflare.com (108.162.192.116)2416412470
gail.ns.cloudflare.com (2803:f800:50::6ca2:c074)2416412470
gail.ns.cloudflare.com (2a06:98c1:50::ac40:2074)2416412470
gail.ns.cloudflare.com (2606:4700:50::adf5:3a74)2416412470
guy.ns.cloudflare.com (172.64.33.173)2416412470
guy.ns.cloudflare.com (173.245.59.173)2416412470
guy.ns.cloudflare.com (108.162.193.173)2416412470
guy.ns.cloudflare.com (2a06:98c1:50::ac40:21ad)2416412470
guy.ns.cloudflare.com (2803:f800:50::6ca2:c1ad)2416412470
guy.ns.cloudflare.com (2606:4700:58::adf5:3bad)2416412470

Checks

  • ✓ Serial 2416412470 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 2h46m40s, retry 40m, expire 7d, negative TTL 30m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver gail.ns.cloudflare.com is one of the listed nameservers.
  • ✓ Contact dns@cloudflare.com #25
    The SOA RNAME dns.cloudflare.com means dns@cloudflare.com.
  • ✓ Timestamp serial #26
    The serial 2416412470 is a Unix timestamp (2046-07-28 17:41 UTC).

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
172.64.32.116:53
TypeValueTTL
SOAgail.ns.cloudflare.com. dns.cloudflare.com. 2416412470 10000 2400 604800 18001800
NSgail.ns.cloudflare.com.86400
NSguy.ns.cloudflare.com.86400
A49.13.43.10560
MX1 aspmx.l.google.com.360
MX10 aspmx2.googlemail.com.360
MX10 aspmx3.googlemail.com.360
MX5 alt1.aspmx.l.google.com.360
MX5 alt2.aspmx.l.google.com.360
TXT"MS=ms10778589"360
TXT"MS=ms75620259"360
TXT"facebook-domain-verification=z1u4i7iwsvvf9noniq39l9so2cfu6n"360
TXT"google-site-verification=6cU_vQ-wV4QuiiJLxCeurWTjfxs297bE3y5tpPvfW9U"360
TXT"google-site-verification=_XYMk42RKvY8i7XTIpoykwx3l7d5VOiejIvAaSU6arg"360
TXT"lemlist-verif=256d7efc"360
TXT"v=spf1 ip4:159.183.72.168 ip4:149.72.221.245 ip4:167.89.88.244 ip4:168.245.94.44 include:mailgun.org include:amazonses.com include:_spf.google.com -all"360
CAA0 iodef "mailto:ssl@survio.cz"360
CAA0 issue "digicert.com"360
CAA0 issue "letsencrypt.org"360

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. The NS TTL at the parent is 2d and in the zone 1d; resolvers may use either.
    #32
  • ✓ No CNAME at the apex #33
    The zone apex has no CNAME record.
  • ✓ No wildcard #34
    Names that don't exist return NXDOMAIN.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: digicert.com, letsencrypt.org.