Domain report: ru.com

Registration

info

.com generic · Sav.com, LLC · expires 2033-02-06

Found

TLD: .com (generic)
Public suffix: .ru.com
ICANN policies apply: yes
Registrar: Sav.com, LLC
Registered: 5 February 1996
Last changed: 9 May 2025
Expires: 6 February 2033
Status: client transfer prohibited, server delete prohibited, server transfer prohibited, server update prohibited
Registry nameservers: ns1.centralnic.net, ns2.centralnic.net, ns3.centralnic.net, ns4.centralnic.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. Domains are registered under the public suffix .ru.com.

#1
✓ TLD delegated and signed #2

.com is delegated in the root zone and DNSSEC-signed.
✓ Expires on 2033-02-06 #3

The registration is valid until 2033-02-06 (2298 days).
✓ Transfer locked #4

Registry status: client transfer 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

info

ns1.centralnic.net, ns2.centralnic.net, ns3.centralnic.net, ns4.centralnic.net

Found

Parent zone: com
Delegation from: a.gtld-servers.net (192.5.6.30)
NS at the parent: ns1.centralnic.net, ns2.centralnic.net, ns3.centralnic.net, ns4.centralnic.net
NS in the zone: ns1.centralnic.net, ns2.centralnic.net, ns3.centralnic.net, ns4.centralnic.net

Nameserver	Addresses	Network (AS)	Glue
ns1.centralnic.net	194.169.218.24 2001:67c:13cc::1:24	AS199330 CENTRALNIC-ANYCAST-A - CentralNic Ltd, GB AS199330 CENTRALNIC-ANYCAST-A - CentralNic Ltd, GB	-
ns2.centralnic.net	185.24.64.10 2a04:2b00:13cc::1:10	AS60890 CENTRALNIC-ANYCAST-B - CentralNic Ltd, GB AS60890 CENTRALNIC-ANYCAST-B - CentralNic Ltd, GB	-
ns3.centralnic.net	212.18.248.10 2a04:2b00:13ee::10	AS201304 CENTRALNIC-ANYCAST-E - CentralNic Ltd, GB AS201304 CENTRALNIC-ANYCAST-E - CentralNic Ltd, GB	-
ns4.centralnic.net	212.18.249.24 2a04:2b00:13ff::24	AS201303 CentralNic-Anycast-F - CentralNic Ltd, GB AS201303 CentralNic-Anycast-F - CentralNic Ltd, GB	-

Checks

✓ 4 nameservers #6

Delegated to ns1.centralnic.net, ns2.centralnic.net, ns3.centralnic.net, ns4.centralnic.net.
✓ 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 4 IPv4 /24s and 4 IPv6 /48s.
✓ 4 autonomous systems #11

The nameservers are spread over: AS199330 (CENTRALNIC-ANYCAST-A - CentralNic Ltd, GB): 2 addresses; AS201303 (CentralNic-Anycast-F - CentralNic Ltd, GB): 2 addresses; AS201304 (CENTRALNIC-ANYCAST-E - CentralNic Ltd, GB): 2 addresses; AS60890 (CENTRALNIC-ANYCAST-B - CentralNic Ltd, GB): 2 addresses.
i

All nameserver names under .net

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

info

8 of 8 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns1.centralnic.net 194.169.218.24	NOERROR, 16 ms, authoritative	no	yes / yes	refused	-
ns1.centralnic.net 2001:67c:13cc::1:24	NOERROR, 16 ms, authoritative	no	yes / yes	refused	-
ns2.centralnic.net 185.24.64.10	NOERROR, 24 ms, authoritative	no	yes / yes	refused	off
ns2.centralnic.net 2a04:2b00:13cc::1:10	NOERROR, 27 ms, authoritative	no	yes / yes	refused	off
ns3.centralnic.net 212.18.248.10	NOERROR, 16 ms, authoritative	no	yes / yes	refused	-
ns3.centralnic.net 2a04:2b00:13ee::10	NOERROR, 15 ms, authoritative	no	yes / yes	refused	-
ns4.centralnic.net 212.18.249.24	NOERROR, 23 ms, authoritative	no	yes / yes	refused	off
ns4.centralnic.net 2a04:2b00:13ff::24	NOERROR, 24 ms, authoritative	no	yes / yes	refused	off

Checks

✓ All respond #14

All 8 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: ns2.centralnic.net: "off"; ns4.centralnic.net: "off".

#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

warn

serial 3000678529 · primary ns0.centralnic.net

Found

Primary (MNAME): ns0.centralnic.net
Contact (RNAME): hostmaster.centralnic.net
Serial: 3000678529
Refresh / retry: 900 s / 1800 s
Expire: 6048000 s
Negative TTL: 3600 s

Serial per nameserver

Nameserver	Serial
ns1.centralnic.net (194.169.218.24)	3000678529
ns1.centralnic.net (2001:67c:13cc::1:24)	3000678529
ns2.centralnic.net (185.24.64.10)	3000678529
ns2.centralnic.net (2a04:2b00:13cc::1:10)	3000678529
ns3.centralnic.net (212.18.248.10)	3000678529
ns3.centralnic.net (2a04:2b00:13ee::10)	3000678529
ns4.centralnic.net (212.18.249.24)	3000678529
ns4.centralnic.net (2a04:2b00:13ff::24)	3000678529

Checks

✓ Serial 3000678529 everywhere #22

All nameservers serve the same version of the zone.
!

Unusual SOA timers

refresh 15m is outside 20m–1d; retry 30m should be shorter than refresh 15m. Current values: refresh 15m, retry 30m, expire 70d, negative TTL 1h.

#23
i

Hidden master

The primary nameserver ns0.centralnic.net 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 hostmaster@centralnic.net #25

The SOA RNAME hostmaster.centralnic.net means hostmaster@centralnic.net.
✓ Timestamp serial #26

The serial 3000678529 is a Unix timestamp (2065-02-01 01:48 UTC).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 0 iterations, 0-byte salt
Signatures valid until: 31 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
30236	RSASHA1-NSEC3-SHA1 (7)	SHA256 6BFA57A56A6A71C5…	NO
10879	RSASHA1-NSEC3-SHA1 (7)	SHA256 9B0E8FAAB64C2541…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
10879	KSK (257)	RSASHA1-NSEC3-SHA1 (7)
9257	ZSK (256)	RSASHA1-NSEC3-SHA1 (7)

Checks

✓ Signed and validated #27

The zone is signed, the parent publishes a DS record, and the resolver validates the answers.
i

Unused DS records

These DS records match no key in the zone: key tag 30236 (SHA256). That is normal during a key rollover; otherwise remove them.

#28
!

Deprecated algorithm

SHA-1 based algorithms are deprecated and rejected by some validators: RSASHA1-NSEC3-SHA1 (7). Roll over to ECDSAP256SHA256 (13).

#29
✓ Signatures valid until 2026-10-31 #30

The earliest DNSKEY/SOA signature expires at 2026-10-31 03:23 UTC.
✓ NSEC3 as recommended #31

The zone uses NSEC3 with 0 iterations and no salt (RFC 9276).

Records

info

7 records at the apex

Found

Read from: 194.169.218.24:53

Type	Value	TTL
SOA	ns0.centralnic.net. hostmaster.centralnic.net. 3000678529 900 1800 6048000 3600	3600
NS	ns4.centralnic.net.	3600
NS	ns3.centralnic.net.	3600
NS	ns1.centralnic.net.	3600
NS	ns2.centralnic.net.	3600
MX	0 .	3600
TXT	"v=spf1 -all"	3600

Checks

✓ TTLs within range #32

TTLs: MX 1h, NS 1h. The NS TTL at the parent is 2d and in the zone 1h; 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