AS overview
Test target: 2a0c:b641:750::2 · static prefix probe · address space: PA · prefixes announced: 1
prefix(es): 2a0c:b641:750::/44
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 | ||
2a0c:b641:750::2 | prb | ✗ | ✗ | ? | ? | - | ✗ | ✗ | ? | ? | - | ✗ | ✗ | ? | ? | - |
RPKI & ASPA
1 of 1 prefix(es) covered by a valid ROA.
| Prefix | RPKI state | Reason | Covering VRP(s) |
|---|---|---|---|
2a0c:b641:750::/44 | ✓ valid | matched VRP (correct origin, length within maxLength) | AS214549 /44 maxLen 128 (ripe) |
Random-IP probe (yarrp) into the AS' prefixes
We probed 15 arbitrary IPv6 address(es) inside AS214549's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2a0c:9a40:24c2::2 at hop 15 - that router answers ICMPv6 Echo. This is not in AS214549'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 active test inconclusive: no Echo Reply to 1300-byte probe.
method: ICMPv6 Echo + forged PTB, tested 2026-05-30T12:47:18Z
Failure detail — what to grep in your logs
| vantage | our source | your target | method | result | tested (UTC) |
|---|---|---|---|---|---|
| go6lab | 2a00:8642:42::75 | 2a0c:b641:750::2 | icmp6-echo | no_echo | 2026-05-30T12:47:18Z |
| karsolink | 2a12:d8c0:105a:9001::a154 | 2a0c:b641:750::2 | icmp6-echo | no_echo | 2026-05-30T12:55:58Z |
| odin | 2607:fae0:a000::42 | 2a0c:b641:750::2 | icmp6-echo | no_echo | 2026-05-30T12:46:58Z |
Attempt log (go6lab):
icmp6-echo→ no_echo: no Echo Reply to 1300-byte probedns-tcp→ no_tcp: connect failed: timed outtls→ no_tcp: TLS connect failedhttp→ no_tcp: tcp/80 not open
Attempt log (karsolink):
icmp6-echo→ no_echo: no Echo Reply to 1300-byte probedns-tcp→ no_tcp: connect failed: timed outtls→ no_tcp: TLS connect failedhttp→ no_tcp: tcp/80 not open
Attempt log (odin):
icmp6-echo→ no_echo: no Echo Reply to 1300-byte probedns-tcp→ no_tcp: connect failed: timed outtls→ no_tcp: TLS connect failedhttp→ no_tcp: tcp/80 not open
To match the corresponding ICMPv6 packet on your side (host firewall, AS edge, or transit tap), look for our PTBs around the timestamps above:
sudo tcpdump -i any -n -e 'icmp6 and ip6[40] = 2 and (src host 2607:fae0:a000::42 or src host 2a00:8642:42::75 or src host 2a12:d8c0:105a:9001::a154)'
If you see our PTBs arriving but the destination's TCP/Echo flow does not shrink, the drop is in the destination kernel (cause 3 below). If you don't see them at all, drop is upstream of you (cause 2). If you only see them from one of our two source IPs, the drop is path-asymmetric — one transit on the asymmetric route is filtering, the other is not.
From NL host (go6lab) all blocked
filter likely at: past AS34927 (iFog-GmbH) · min PMTU on path: 1476
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | 2a00:8642:42::3 | 1.1ms | 0% | AS203993 | STEFFANN-DC-AS - S.J.M. Steffann, NL |
| 2 | gw.friends.steffann.nl 2a00:8642:1000:f000::1 | 2.3ms | 0%* | AS203993 | STEFFANN-DC-AS - S.J.M. Steffann, NL |
| 3 | 2a00:1ca8:1::194 | 2.8ms | 10% | AS50673 | Serverius-as - Serverius Holding B.V., NL |
| 4 | 2a03:3f40::10:41 | 3.2ms | 10% | AS50673 | Serverius-as - Serverius Holding B.V., NL |
| 5 | speed-ix.inter.link 2001:7f8:b7::a500:5405:1 | 4.5ms | 0% | - | NA |
| 6 | r4-ams1-nl.as5405.net 2a11:4140::10 | 11.0ms | 0% | AS5405 | INTERDOTLINK - Inter.link GmbH, DE |
| 7 | r6-ams1-nl.as5405.net 2a11:4140::54 | 10.7ms | 0% | AS5405 | INTERDOTLINK - Inter.link GmbH, DE |
| 8 | r4-fra3-de.as5405.net 2a11:4140::37 | 10.6ms | 0% | AS5405 | INTERDOTLINK - Inter.link GmbH, DE |
| 9 | r3-fra2-de.as5405.net 2a11:4140::a | 10.8ms | 0% | AS5405 | INTERDOTLINK - Inter.link GmbH, DE |
| 10 | r4-fra2-de.as5405.net 2a11:4140::b | 10.6ms | 0% | AS5405 | INTERDOTLINK - Inter.link GmbH, DE |
| 11 | r7-fra1-de.as5405.net 2a11:4140::4c | 10.8ms | 0% | AS5405 | INTERDOTLINK - Inter.link GmbH, DE |
| 12 | r3-fra1-de.as5405.net 2a11:4140::6 | 10.5ms | 0% | AS5405 | INTERDOTLINK - Inter.link GmbH, DE |
| 13 | r1-fra1-de.as5405.net 2a11:4140::4 | 10.5ms | 0% | AS5405 | INTERDOTLINK - Inter.link GmbH, DE |
| 14 | 2a11:4140:2002::5f | 10.6ms | 0% | AS5405 | INTERDOTLINK - Inter.link GmbH, DE |
| 15 | 2a0c:9a40:24c2::2 | 12.7ms | 0% | AS34927 | iFog-GmbH - iFog GmbH, CH |
| 16 | * | - | - | - | |
| 17 | * | - | - | - | |
| 18 | * | - | - | - | |
| 19 | * | - | - | - | |
| 20 | * | - | - | - | |
| 21 | * | - | - | - | |
| 22 | * | - | - | - | |
| 23 | * | - | - | - | |
| 24 | * | - | - | - |
Rate-limited ICMPv6: hop 3, hop 4 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).
tracepath -6
1?: [LOCALHOST] 0.037ms pmtu 1476
1: 2a00:8642:42::3 1.211ms
1: 2a00:8642:42::3 1.089ms
2: gw.friends.steffann.nl 2.219ms
3: 2a00:1ca8:1::194 2.573ms
4: 2a03:3f40::10:41 2.439ms
5: speed-ix.inter.link 4.450ms asymm 4
6: r4-ams1-nl.as5405.net 10.342ms asymm 19
7: r6-ams1-nl.as5405.net 10.316ms asymm 18
8: r4-fra3-de.as5405.net 10.040ms asymm 17
9: r3-fra2-de.as5405.net 10.329ms asymm 16
10: r4-fra2-de.as5405.net 10.349ms asymm 15
11: r7-fra1-de.as5405.net 10.166ms asymm 14
12: r3-fra1-de.as5405.net 10.582ms asymm 13
13: r1-fra1-de.as5405.net 10.501ms asymm 12
14: 2a11:4140:2002::5f 10.618ms asymm 12
15: 2a0c:9a40:24c2::2 12.164ms asymm 6
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 1476
Resume: pmtu 1476 From ITA host (Karsolink) all blocked
filter likely at: past AS34872 (Servperso_Systems) · min PMTU on path: 1500
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | karsolink-01.net.karsolink.com 2a12:d8c0:105a:9001::1 | 0.5ms | 0%* | AS204471 | KARSOLINK - 2S Computers SRL, IT |
| 2 | * | - | - | - | |
| 3 | 2a12:d8c0:101f:6::1 | 10.0ms | 0% | AS204471 | KARSOLINK - 2S Computers SRL, IT |
| 4 | myloc.minap.it 2001:7f8:c5::a502:4961:1 | 10.1ms | 0% | AS24961 | myLoc managed IT AG |
| 5 | 2001:4ba0:ffe9:c6 | 14.1ms | 0% | - | |
| 6 | lag0-vl1017.core1-fra-eq5.bb.wiit.network 2001:4ba0:ffe9:b7::1 | 19.1ms | 0% | AS24961 | MYLOC-AS - WIIT AG, DE |
| 7 | lag5.core2-dus-ix.bb.wiit.network 2001:4ba0:ffe9:d6::3 | 22.3ms | 0% | AS24961 | MYLOC-AS - WIIT AG, DE |
| 8 | lag4.core1-dus-ix.bb.wiit.network 2001:4ba0:ffe9:6a::1 | 22.1ms | 0% | AS24961 | MYLOC-AS - WIIT AG, DE |
| 9 | lag7.core2-dus3.bb.wiit.network 2001:4ba0:ffe9:42::2 | 22.3ms | 0% | AS24961 | MYLOC-AS - WIIT AG, DE |
| 10 | lag2-h3679.edge3-dus3.bb.wiit.network 2001:4ba0:ffe9:7a::2 | 23.6ms | 0% | AS24961 | MYLOC-AS - WIIT AG, DE |
| 11 | 2001:4ba0:dead:b051::3 | 23.0ms | 0% | AS24961 | MYLOC-AS - WIIT AG, DE |
| 12 | 2a0c-b640-ffff-100-120-7-128-134.edge.isp.servpersosystems.net 2a0c:b640:ffff:100:120:7:128:134 | 23.1ms | 0% | AS34872 | Servperso_Systems - Sarah Rossius trading as Servperso Systems, BE |
| 13 | * | - | - | - | |
| 14 | * | - | - | - | |
| 15 | * | - | - | - | |
| 16 | * | - | - | - | |
| 17 | * | - | - | - | |
| 18 | * | - | - | - | |
| 19 | * | - | - | - | |
| 20 | * | - | - | - | |
| 21 | * | - | - | - | |
| 22 | * | - | - | - | |
| 23 | * | - | - | - | |
| 24 | * | - | - | - |
tracepath -6
1?: [LOCALHOST] 0.059ms pmtu 1500
1: karsolink-01.net.karsolink.com 0.856ms
1: karsolink-01.net.karsolink.com 0.771ms
2: 2a12:d8c0:109f:121::a1 0.940ms
3: 2a12:d8c0:101f:6::1 10.484ms
4: myloc.minap.it 10.738ms
5: lag0-vl1002.core1-lpg-green-lu2.bb.wiit.network 14.713ms
6: lag0-vl1017.core1-fra-eq5.bb.wiit.network 19.343ms
7: lag5.core2-dus-ix.bb.wiit.network 22.664ms
8: lag26.core3-dus1.bb.wiit.network 23.541ms
9: lag7.core2-dus3.bb.wiit.network 22.936ms
10: lag2-h3679.edge3-dus3.bb.wiit.network 48.782ms
11: 2001:4ba0:dead:b051::3 23.320ms asymm 9
12: 2a0c-b640-ffff-100-120-7-128-134.edge.isp.servpersosystems.net 23.708ms asymm 10
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) all blocked
filter likely at: before path completes · min PMTU on path: 1476
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | fw1-lju.6connect.com 2607:fae0:a000::2 | 0.5ms | 0%* | AS8038 | 6CONNECT - 6connect, Inc., US |
| 2 | * | - | - | - | |
| 3 | 2a03:a100:0:201:1::1 | 0.7ms | 0% | AS56635 | XENYA - XENYA inzeniring, proizvodnja in trgovina, d.o.o. Ljubljana, SI |
| 4 | * | - | 0% | - | |
| 5 | 100ge0-0-0-5.core1.vie1.he.net 2001:470:0:578::1 | 8.1ms | 0% | AS6939 | HURRICANE - Hurricane Electric LLC, US |
| 6 | 100ge0-0-0-19.core2.fra2.he.net 2001:470:0:7ef::1 | 19.6ms | 0% | AS6939 | HURRICANE - Hurricane Electric LLC, US |
| 7 | 2001:7f8:15e::64 | 17.3ms | 0% | - | NA |
| 8 | * | - | - | - | |
| 9 | * | - | - | - | |
| 10 | * | - | - | - | |
| 11 | * | - | - | - | |
| 12 | * | - | - | - | |
| 13 | * | - | - | - | |
| 14 | * | - | - | - | |
| 15 | * | - | - | - | |
| 16 | * | - | - | - | |
| 17 | * | - | - | - | |
| 18 | * | - | - | - | |
| 19 | * | - | - | - | |
| 20 | * | - | - | - | |
| 21 | * | - | - | - | |
| 22 | * | - | - | - | |
| 23 | * | - | - | - | |
| 24 | * | - | - | - |
tracepath -6
1?: [LOCALHOST] 0.044ms pmtu 1500
1: fw1-lju.6connect.com 0.659ms
1: fw1-lju.6connect.com 0.368ms
2: no reply
3: 2a03:a100:0:201:1::1 0.804ms
4: e0-1.core1.lju1.he.net 1.682ms
5: 100ge0-0-0-5.core1.vie1.he.net 8.453ms
6: 100ge0-0-0-19.core2.fra2.he.net 18.779ms asymm 7
7: 2001:7f8:15e::64 17.142ms asymm 8
8: 2001:7f8:15e::64 17.558ms pmtu 1476
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 1476