JavaScript Required
This site requires JavaScript, as well as the ability to pull in cross-site scripts, in order to perform the testing.
If this message does not go away, it means that JavaScript has been disabled, either by a plugin or extension in your browser, or by explicit browser setting.
Do you use NoScript?
If you use this Firefox add-on, you'll need to "Temporarily allow all this page". You will need to do this twice for everything to work. Alternately, disable NoScript entirely until you are done with this site.
You can opt instead to view the simple test, which will give you a quick pass/fail for IPv4, IPv4+IPv6, and IPv6. It will however offer little diagnostic information.
| Vaša verejná IPv4 adresa sa zdá byť 216.73.216.25 |
| Your Internet Service Provider (ISP) appears to be AMAZON-02 |
| Nebola zistená IPv6 adresa [viacej informácií] |
| You appear to be able to browse the IPv4 Internet only. You will not be able to reach IPv6-only sites. |
| To ensure the best Internet performance and connectivity, ask your ISP about native IPv6. [viacej informácií] |
| Your DNS server (possibly run by your ISP) appears to have IPv6 Internet access. |
| Your readiness score | |
|---|---|
| 0/10 | for your IPv6 stability and readiness, when publishers are forced to go IPv6 only |
Kliknutím zobrazíte Test Data
How this test works: Your browser will be instructed to reach a series of URLs. The combination of successes and failures tells a story about how ready you are for when publishers start offering their web sites on IPv6.
Kliknutím zobrazíte Technical Info
| Test with IPv4 DNS record |
ok (1.548s) using ipv4
|
|
| Test with IPv6 DNS record |
zlý (0.974s)
|
|
| Test with Dual Stack DNS record |
ok (1.460s) using ipv4
|
|
| Test for Dual Stack DNS and large packet |
ok (3.803s) using ipv4
|
|
| Test IPv6 large packet |
zlý (0.891s)
|
|
| Test if your ISP's DNS server uses IPv6 |
ok (1.882s) using ipv4
|
|
| Find IPv4 Service Provider |
ok (1.003s) using ipv4 ASN 16509
|
|
| Find IPv6 Service Provider |
zlý (0.723s)
|
Kliknutím zobrazíte Share Results / Contact
How this test works: Your browser will be instructed to reach a series of URLs. The combination of successes and failures tells a story about how ready you are for when publishers start offering their web sites on IPv6.
Kliknutím zobrazíte Tests Run
|
Test with IPv4 DNS record
ok (1.548s) using ipv4
|
Fetches an object that has just an A record in DNS. This is expected to use IPv4. IPv6-only users might still reach this, if their provider has employed a NAT64/DNS64 or proxy solution.
|
|
Test with IPv6 DNS record
zlý (0.974s)
|
Fetches an object that has just an AAAA record in DNS. This is expected to use IPv6. Users not yet on the IPv6 Internet are likely to see this fail. As long as it fails quickly, it will be OK - for now.
|
|
Test with Dual Stack DNS record
ok (1.460s) using ipv4
|
This is the most important test. This verifies your browser can connect to a site that has both IPv4 and IPv6 records published. IPv4 only hosts should connect fine (using IPv4).
If this test fails or times out, you can expect major problems as publishers start offering their sites on IPv6. |
|
Test for Dual Stack DNS and large packet
ok (3.803s) using ipv4
|
Validates that you can connect to a dual-stack server (like the ds test); and that you can send/receive large packets on that connection. If this test times out for any reason, it indicates trouble for World IPv6 Day.
|
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Test IPv6 large packet
zlý (0.891s)
|
Validates that IPv6 requests with large packets work. If this test times out, but other IPv6 tests work, it suggests that there may be PMTUD issues; possibly involving IP tunnels.
Double check to make sure that ICMPv6 Type 2 ("Packet Too Big") messages are not filtered by your firewall.
|
|
Test if your ISP's DNS server uses IPv6
ok (1.882s) using ipv4
(This is bonus credit)
|
This is a test of your ISP's resolver (instead of a test of your host). If this test passes, your DNS server (often run by your ISP) is capable of reaching IPV6-only DNS authoritative servers on the Internet. This is not critical (at this time) for you to reach sites via IPv6.
|
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Find IPv4 Service Provider
ok (1.003s) using ipv4 ASN 16509
|
Attempts to identify what Internet Service Provider you use for IPv4. This may be different from the marketing name you see in your local market; or may reflect a previous company name. The name shown reflects how it is known in the network operator community.
|
|
Find IPv6 Service Provider
zlý (0.723s)
|
Attempts to identify what Internet Service Provider you use for IPv6. When the IPv4 name and the IPv6 name don't match, it may suggest that you're using a tunnel; or some form of third party provider for IPv6.
|
If the summary results indicated problems, you (or your technical support) may be able to use the information above to diagnose the issues. Each of the test urls and their results is shown on the left side. To the right you'll see a description of what that URL was designed to test.
Kliknutím zobrazíte Share Results / Contact
Your Internet help desk may ask you for the information below.
Help desk code: 4
IPv4 Only
More information about this page, including how to bookmark it: faq_helpdesk.html.
If your Internet help desk asks you to mail the 'results url', copy and paste the following URL. Note that this will share your current numeric Internet Protocol address(es). We do not recommend posting this link on public web sites such as forums.
On most computers, you can right-click the above URL, and select 'Copy'.
{
"test_asn4": {
"start_time": 1752229894669,
"url": "https://ipv4.lookup.test-ipv6.com/ip/?callback=?&asn=1&testdomain=test-ipv6.cz&testname=test_asn4",
"ipinfo": {
"ip": "216.73.216.25",
"type": "ipv4",
"subtype": "",
"via": "",
"asn": "16509",
"asnlist": "16509",
"asn_name": "AMAZON-02",
"country": "US",
"protocol": "HTTP/1.1"
},
"time_ms": 1003,
"status": "ok"
},
"test_asn6": {
"start_time": 1752229894691,
"url": "https://ipv6.lookup.test-ipv6.com/ip/?callback=?&asn=1&testdomain=test-ipv6.cz&testname=test_asn6",
"time_ms": 723,
"status": "bad"
},
"test_a": {
"start_time": 1752229894713,
"url": "https://ipv4.test-ipv6.cz/ip/?callback=?&testdomain=test-ipv6.cz&testname=test_a",
"ipinfo": {
"ip": "216.73.216.25",
"type": "ipv4",
"subtype": "",
"via": ""
},
"time_ms": 1548,
"status": "ok"
},
"test_aaaa": {
"start_time": 1752229894734,
"url": "https://ipv6.test-ipv6.cz/ip/?callback=?&testdomain=test-ipv6.cz&testname=test_aaaa",
"time_ms": 974,
"status": "bad"
},
"test_ds": {
"start_time": 1752229894756,
"url": "https://ds.test-ipv6.cz/ip/?callback=?&testdomain=test-ipv6.cz&testname=test_ds",
"ipinfo": {
"ip": "216.73.216.25",
"type": "ipv4",
"subtype": "",
"via": ""
},
"time_ms": 1460,
"status": "ok"
},
"test_v6mtu": {
"start_time": 1752229894777,
"url": "https://mtu1280.test-ipv6.cz/ip/?callback=?&size=1600&fill=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx&testdomain=test-ipv6.cz&testname=test_v6mtu",
"time_ms": 891,
"status": "bad"
},
"test_v6ns": {
"start_time": 1752229894799,
"url": "https://ds.v6ns.test-ipv6.cz/ip/?callback=?&testdomain=test-ipv6.cz&testname=test_v6ns",
"ipinfo": {
"ip": "216.73.216.25",
"type": "ipv4",
"subtype": "",
"via": ""
},
"time_ms": 1882,
"status": "ok"
},
"test_dsmtu": {
"start_time": 1752229894820,
"url": "https://ds.test-ipv6.cz/ip/?callback=?&size=1600&fill=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx&testdomain=test-ipv6.cz&testname=test_dsmtu",
"ipinfo": {
"ip": "216.73.216.25",
"type": "ipv4",
"subtype": "",
"via": ""
},
"time_ms": 3803,
"status": "ok"
},
"test_ood": {
"start_time": 1752229894841,
"url": "//test-ipv6.com/images/ood_b69414e2.png?&testdomain=test-ipv6.cz&testname=test_ood",
"time_ms": 665,
"image": 1,
"status": "bad"
},
"test_v6mtu_img": {
"start_time": 1752229895672,
"url": "https://mtu1280.test-ipv6.cz/images-nc/hires_ok.png?&fill=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx&testdomain=test-ipv6.cz&testname=test_v6mtu_img",
"time_ms": 7,
"image": 1,
"status": "bad"
},
"test_ds4": {
"url": "https://ds.test-ipv6.cz/ip/?callback=?&testdomain=test-ipv6.cz&testname=test_ds",
"time_ms": 1460,
"status": "ok"
},
"test_ds6": {
"url": "https://ds.test-ipv6.cz/ip/?callback=?&testdomain=test-ipv6.cz&testname=test_ds",
"time_ms": 1460,
"status": "bad"
},
"test_aaaa_img": {
"start_time": 1752229896216,
"url": "https://ipv6.test-ipv6.cz/images-nc/bg.gif?&testdomain=test-ipv6.cz&testname=test_aaaa_img",
"time_ms": 5,
"image": 1,
"status": "bad"
}
}Hint: Columns are sortable (click the first row); click here to re-check reachability from where you are to those mirrors.
It is real easy to get added to this list for basic checks. Just provide two image URLs (one IPv4-only; one IPv6-only), to Jason Fesler <jfesler@gigo.com>. Also send your general web site address and organization name.
This form will let you leave a comment, voice concerns, or ask questions. Your test results will be included automatically. This includes your IP address, which is shared with the site administrator in order to answer your questions. Use of this form implies consent.
Najčastejšie kladené otázky (FAQ) page is available for your exact set of results. Please read it before leaving comments; many questions have already been answered. If you still have questions, comments, or concerns, feel free to use this form.
If reporting a problem with the test, or requesting help with your results, please fill out all requested information to the best of your ability. If leaving general comments, use your best judgement on how much to report.
Ďakujeme,
CZ.NIC z.s.p.o <contact@test-ipv6.cz>