AS overview
Test target: 2a07:2840::3 · ns1.x4w.net · address space: unknown · prefixes announced: 5
prefix(es): 2001:b60::/32, 2a0a:ec00::/32, 2a07:2847::/32, 2001:b61::/32, 2a07:2840::/32
Targets & per-vantage-point probe results (1 target(s) across 3 vantage point(s))
Source codes (hover any badge for full description): CUR=curated · NS/SOA/MX=DNS records · SPF=SPF TXT · DRV=holder-derived (www, ns1, mail, gw, …) · ATL=RIPE Atlas · PDB=PeeringDB · WHOIS=RIPE whois · RDAP=RIPE RDAP · HIT=IPv6 Hitlist · RTR=in-prefix path hop (router) · PRB=static prefix probe · SYN=synthetic prefix::1 fallback
| Target IP / hostname | Source | NL host (go6lab) | ITA host (Karsolink) | SLO host (6connect) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ping | 1500B | :80 | :443 | reached | ping | 1500B | :80 | :443 | reached | ping | 1500B | :80 | :443 | reached | ||
2a07:2840::3ns1.x4w.net | NS | ✓ | ✓ | ? | open | - | ✓ | ✓ | ? | open | - | ✓ | ✓ | ? | open | - |
MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO peering
MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO member - Open peering, peering member, since 2013-05-14. IPv6 LAN: 2001:7f8:b:100:1d1:a5d2:836:16. Locations: -.
RPKI & ASPA
3 of 5 prefix(es) covered by a valid ROA, 2 not-found.
| Prefix | RPKI state | Reason | Covering VRP(s) |
|---|---|---|---|
2001:b60::/32 | ✓ valid | matched VRP (correct origin, length within maxLength) | AS20836 /32 maxLen 48 (ripe) |
2a0a:ec00::/32 | - not-found | no covering VRP | |
2a07:2847::/32 | - not-found | no covering VRP | |
2001:b61::/32 | ✓ valid | matched VRP (correct origin, length within maxLength) | AS20836 /32 maxLen 32 (ripe) |
2a07:2840::/32 | ✓ valid | matched VRP (correct origin, length within maxLength) | AS20836 /32 maxLen 32 (ripe) |
Random-IP probe (yarrp) into the AS' prefixes
We probed 29 arbitrary IPv6 address(es) inside AS20836's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2001:4c08::1b at hop 10 - that router answers ICMPv6 Echo. This is not in AS20836's announced prefix; operationally it's the AS-edge / peering interface (often on an IXP peering address or an upstream's /127 link). The traceroute boundary is the AS edge: ICMPv6 Time-Exceeded responses from anything inside this AS are filtered.
ICMPv6 Type 2 (Packet Too Big) acceptance - active test
Type 2 honored. Forged ICMPv6 PTB (MTU=1280) was accepted by the destination's stack: the next 1500-byte Echo Reply arrived split into 2 fragments via the IPv6 Fragment Header.
method: ICMPv6 Echo + forged PTB, tested 2026-05-30T12:46:07Z
From NL host (go6lab) openRFC 4890 ✓
filter likely at: (none) · min PMTU on path: 1500
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | 2a00:8642:42::3 | 1.0ms | 0% | AS203993 | STEFFANN-DC-AS - S.J.M. Steffann, NL |
| 2 | * | - | 0%* | - | |
| 3 | 2a00:1ca8:1::194 | 2.7ms | 0% | AS50673 | Serverius-as - Serverius Holding B.V., NL |
| 4 | 2a03:3f40::10:41 | 2.0ms | 0% | AS50673 | Serverius-as - Serverius Holding B.V., NL |
| 5 | ix-ge-100-0-0-66.qhar2.ad1-amsterdam.ipv6.as6453.net 2a01:3e0:30:1::1 | 4.4ms | 0% | AS6453 | AS6453 - TATA COMMUNICATIONS (AMERICA) INC, US |
| 6 | if-bundle-2-2.qcore1.ad1-amsterdam.ipv6.as6453.net 2a01:3e0:701::7 | 3.0ms | 0% | AS6453 | AS6453 - TATA COMMUNICATIONS (AMERICA) INC, US |
| 7 | if-bundle-52-2.qcore2.av2-amsterdam.ipv6.as6453.net 2a01:3e0:701::11 | 4.0ms | 40% | AS6453 | AS6453 - TATA COMMUNICATIONS (AMERICA) INC, US |
| 8 | if-be-41-2.ecore1.av2-amsterdam.ipv6.as6453.net 2a01:3e0:ff40:100::5 | 3.5ms | 50% | AS6453 | AS6453 - TATA COMMUNICATIONS (AMERICA) INC, US |
| 9 | ae28.edge7.ams1.sp.lumen.tech 2001:1900:5:3::201 | 5.1ms | 0% | AS3356 | LEVEL3 - Level 3 Parent, LLC, US |
| 10 | lo0.0.edge1.Milan2.level3.net 2001:4c08::1b | 32.1ms | 0% | AS3356 | LEVEL3 - Level 3 Parent, LLC, US |
| 11 | 2001:1900:5:2:2::5102 | 21.9ms | 0% | AS3356 | LEVEL3 - Level 3 Parent, LLC, US |
| 12 | 2001:b60:0:a01e::1 | 25.8ms | 0% | AS20836 | CDLAN-AS - CDLAN SpA, IT |
| 13 | 2001:b60:1200::1 | 29.9ms | 0% | AS20836 | CDLAN-AS - CDLAN SpA, IT |
| 14 | 2001:b60:1:4::1 | 26.1ms | 0% | AS20836 | CDLAN-AS - CDLAN SpA, IT |
| 15 | * | - | 0% | - | |
| 16 | * | - | - | - | |
| 17 | * | - | - | - | |
| 18 | * | - | - | - | |
| 19 | * | - | - | - | |
| 20 | * | - | - | - | |
| 21 | * | - | - | - | |
| 22 | * | - | - | - | |
| 23 | * | - | - | - | |
| 24 | * | - | - | - |
Rate-limited ICMPv6: hop 7, hop 8 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).
tracepath -6
1?: [LOCALHOST] 0.048ms pmtu 1500
1: 2a00:8642:42::3 1.924ms
1: 2a00:8642:42::3 2.039ms
2: no reply
3: 2a00:1ca8:1::194 4.516ms
4: 2a03:3f40::10:41 3.691ms
5: ix-et-9-1-2.tcore1.ad1-amsterdam.ipv6.as6453.net 7.648ms
6: if-bundle-2-2.qcore1.ad1-amsterdam.ipv6.as6453.net 4.970ms
7: if-bundle-52-2.qcore2.av2-amsterdam.ipv6.as6453.net 4.115ms
8: no reply
9: ae28.edge7.ams1.sp.lumen.tech 4.181ms asymm 7
10: lo0.0.edge1.Milan2.level3.net 46.650ms asymm 12
11: 2001:1900:5:2:2::5102 23.165ms asymm 10
12: 2001:b60:0:a01e::1 27.585ms asymm 11
13: 2001:b60:1200::1 31.322ms asymm 12
14: 2001:b60:1:4::1 27.116ms asymm 12
15: no reply
16: no reply
17: no reply
18: no reply
19: no reply
20: no reply
21: no reply
22: no reply
23: no reply
24: no reply
Too many hops: pmtu 1500
Resume: pmtu 1500 From ITA host (Karsolink) openRFC 4890 ✓
filter likely at: (none) · min PMTU on path: 1500
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | * | - | - | - | |
| 2 | * | - | - | - | |
| 3 | * | - | - | - | |
| 4 | cdlan.minap.it 2001:7f8:c5::a502:836:1 | 9.3ms | 0% | AS20836 | CDLAN s.r.l. |
| 5 | 2001:b60:0:a01d::1 | 9.2ms | 0% | AS20836 | CDLAN-AS - CDLAN SpA, IT |
| 6 | 2001:b60:1200::1 | 9.2ms | 0% | AS20836 | CDLAN-AS - CDLAN SpA, IT |
| 7 | 2001:b60:1:4::1 | 9.3ms | 0% | AS20836 | CDLAN-AS - CDLAN SpA, IT |
| 8 | * | - | 0% | - | |
| 9 | * | - | - | - | |
| 10 | * | - | - | - | |
| 11 | * | - | - | - | |
| 12 | * | - | - | - | |
| 13 | * | - | - | - | |
| 14 | * | - | - | - | |
| 15 | * | - | - | - | |
| 16 | * | - | - | - | |
| 17 | * | - | - | - | |
| 18 | * | - | - | - | |
| 19 | * | - | - | - | |
| 20 | * | - | - | - | |
| 21 | * | - | - | - | |
| 22 | * | - | - | - | |
| 23 | * | - | - | - | |
| 24 | * | - | - | - |
tracepath -6
1?: [LOCALHOST] 0.031ms pmtu 1500
1: karsolink-01.net.karsolink.com 2.050ms
2: 2a12:d8c0:109f:121::a1 3.029ms
3: 2a12:d8c0:101f:6::1 10.407ms
4: cdlan.minap.it 9.990ms asymm 5
5: 2001:b60:0:a01d::1 9.886ms asymm 6
6: 2001:b60:1200::1 9.816ms asymm 7
7: 2001:b60:1:4::1 9.948ms asymm 8
8: no reply
9: no reply
10: no reply
11: no reply
12: no reply
13: no reply
14: no reply
15: no reply
16: no reply
17: no reply
18: no reply
19: no reply
20: no reply
21: no reply
22: no reply
23: no reply
24: no reply
Too many hops: pmtu 1500
Resume: pmtu 1500 From SLO host (6connect) openRFC 4890 ✓
filter likely at: (none) · min PMTU on path: 1500
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | fw1-lju.6connect.com 2607:fae0:a000::2 | 0.3ms | 0%* | AS8038 | 6CONNECT - 6connect, Inc., US |
| 2 | * | - | 0%* | - | |
| 3 | 2a03:a100:0:201:1::1 | 0.9ms | 80% | AS56635 | XENYA - XENYA inzeniring, proizvodnja in trgovina, d.o.o. Ljubljana, SI |
| 4 | e0-1.core1.lju1.he.net 2001:470:1:5be::1 | 1.9ms | 0% | AS6939 | HURRICANE - Hurricane Electric LLC, US |
| 5 | * | - | - | - | |
| 6 | port-channel1.core1.zag2.he.net 2001:470:0:2ea::2 | 4.3ms | 40% | AS6939 | HURRICANE - Hurricane Electric LLC, US |
| 7 | * | - | - | - | |
| 8 | cdlan.topix.it 2001:7f8:23:ffff::86 | 10.5ms | 0% | - | NA |
| 9 | 2001:b60:0:a01d::1 | 10.2ms | 0% | AS20836 | CDLAN-AS - CDLAN SpA, IT |
| 10 | 2001:b60:1200::1 | 10.3ms | 0% | AS20836 | CDLAN-AS - CDLAN SpA, IT |
| 11 | 2001:b60:1:4::1 | 10.1ms | 0% | AS20836 | CDLAN-AS - CDLAN SpA, IT |
| 12 | * | - | 0% | - | |
| 13 | * | - | - | - | |
| 14 | * | - | - | - | |
| 15 | * | - | - | - | |
| 16 | * | - | - | - | |
| 17 | * | - | - | - | |
| 18 | * | - | - | - | |
| 19 | * | - | - | - | |
| 20 | * | - | - | - | |
| 21 | * | - | - | - | |
| 22 | * | - | - | - | |
| 23 | * | - | - | - | |
| 24 | * | - | - | - |
Rate-limited ICMPv6: hop 3, hop 6 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).
tracepath -6
1?: [LOCALHOST] 0.031ms pmtu 1500
1: fw1-lju.6connect.com 4.314ms
1: fw1-lju.6connect.com 0.960ms
2: no reply
3: no reply
4: e0-1.core1.lju1.he.net 2.262ms
5: no reply
6: port-channel1.core1.zag2.he.net 3.964ms
7: no reply
8: cdlan-v6.mix-it.net 10.485ms asymm 6
9: 2001:b60:0:a01d::1 10.257ms asymm 8
10: 2001:b60:1200::1 15.331ms
11: 2001:b60:1:4::1 10.957ms asymm 10
12: no reply
13: no reply
14: no reply
15: no reply
16: no reply
17: no reply
18: no reply
19: no reply
20: no reply
21: no reply
22: no reply
23: no reply
24: no reply
Too many hops: pmtu 1500
Resume: pmtu 1500