AS overview
Test target: 2a13:9500:b8::1 · static prefix probe · address space: unknown · prefixes announced: 1
prefix(es): 2a13:9500:b8::/48
Targets & per-vantage-point probe results (1 target(s) across 7 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 | SRB host (SOX, Belgrade) | DE host (Berlin) | DE host (Düsseldorf) | NL host (go6lab) | ITA host (Karsolink) | SLO host (6connect) | SLO host (T-2) | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ping | 1500B | :80 | :443 | reached | ping | 1500B | :80 | :443 | reached | ping | 1500B | :80 | :443 | reached | ping | 1500B | :80 | :443 | reached | ping | 1500B | :80 | :443 | reached | ping | 1500B | :80 | :443 | reached | ping | 1500B | :80 | :443 | reached | ||
2a13:9500:b8::1 | prb | ✗ | ✗ | ? | ? | - | ✗ | ✗ | ? | ? | - | ✗ | ✗ | ? | ? | - | ✗ | ✗ | ? | ? | - | ✗ | ✗ | ? | ? | - | ✗ | ✗ | ? | ? | - | ✗ | ✗ | ? | ? | - |
RPKI & ASPA
1 of 1 prefix(es) covered by a valid ROA.
| Prefix | RPKI state | Reason | Covering VRP(s) |
|---|---|---|---|
2a13:9500:b8::/48 | ✓ valid | matched VRP (correct origin, length within maxLength) | AS57142 /48 maxLen 48 (ripe) |
Random-IP probe (yarrp) into the AS' prefixes
We probed 35 arbitrary IPv6 address(es) inside AS57142's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2a02:2d8:4:2806:232a::1 at hop 8 - that router answers ICMPv6 Echo. This is not in AS57142'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 2026-09-23T12:09:33Z
Failure detail - what to grep in your logs
| vantage | our source | your target | method | result | tested (UTC) |
|---|---|---|---|---|---|
| belgrade | 2a09:ab81::91 | 2a13:9500:b8::1 | icmp6-echo | no_echo | 2026-09-23T12:09:33Z |
| berlin | 2a06:d1c1:10b::cccc | 2a13:9500:b8::1 | icmp6-echo | no_echo | 2026-09-23T12:09:32Z |
| duseldorf | 2a06:d1c1:10d::aaaa | 2a13:9500:b8::1 | icmp6-echo | no_echo | 2026-09-23T12:09:30Z |
| go6lab | 2a00:8642:42::75 | 2a13:9500:b8::1 | icmp6-echo | no_echo | 2026-09-23T12:11:25Z |
| karsolink | 2a12:d8c0:105a:9001::a154 | 2a13:9500:b8::1 | icmp6-echo | no_echo | 2026-09-23T12:09:29Z |
| odin | 2607:fae0:a000::42 | 2a13:9500:b8::1 | icmp6-echo | no_echo | 2026-09-23T12:09:30Z |
| t2 | 2a01:261:313:b814:2a0:98ff:fe5b:13e4 | 2a13:9500:b8::1 | icmp6-echo | no_echo | 2026-09-23T12:09:32Z |
Attempt log (belgrade):
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 (berlin):
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 (duseldorf):
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 (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
Attempt log (t2):
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 2a01:261:313:b814:2a0:98ff:fe5b:13e4 or src host 2a06:d1c1:10b::cccc or src host 2a06:d1c1:10d::aaaa or src host 2a09:ab81::91 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 some of our source IPs but not others, the drop is path-asymmetric - at least one transit on the differing route is filtering.
Multi-vantage path map
Every hop of all vantages’ traceroutes toward the target, drawn left→right, grouped into per-AS bubbles (a hop seen from several vantages is one shared bubble, so converging paths merge). It answers two questions per vantage — shown on each source bubble as echo ✓/⚠/✗ · trace ✓/✗: did the destination reply to ICMPv6 Echo (✓ honored, ⚠ replied but PTB not honored, ✗ no reply), and did the traceroute reach it. A line to the target is drawn only when that vantage got an echo reply — solid if the PTB was honored, dashed if not (reachable but a broken-PMTUD / RFC 4890 violation). The path depth still shows how far the traceroute itself got, and runs of unanswered (* *) hops collapse into one dashed “silent” bubble. Open full size ↗
- ● SRB host (SOX, Belgrade)
- ● DE host (Berlin)
- ● DE host (Düsseldorf)
- ● NL host (go6lab)
- ● ITA host (Karsolink)
- ● SLO host (6connect)
- ● SLO host (T-2)
- ── solid line = echo reply, PTB honored (clean reach)
- — — dashed line = echo reply but PTB not honored (RFC 4890 violation)
- no line = no echo reply (never reached)
- ◉ target: green = clean, amber = reachable-but-violation / unreachable
- ⚠ suspected drop AS
- ⋯ silent (unanswered) hops
- ● IXP hop
From SRB host (SOX, Belgrade) all blocked
filter likely at: past AS9002 (RETN-AS) · min PMTU on path: 1500
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | 2a09:ab81::1 | 0.3ms | 0%* | AS60733 | PERKE-NET - ZORAN PEROVIC trading as Agencija Perke.NET, RS |
| 2 | 2001:7f8:1e::4 | 0.5ms | 0% | AS13004 | SOX - Serbian Open Exchange DOO, RS |
| 3 | 2001:7f8:30:0:2:1:0:9002 | 12.7ms | 0% | - | NA |
| 4 | RT.NMX.ROM.IT.retn.net 2a02:2d8::57f5:e08f | 27.4ms | 0% | AS9002 | RETN-AS - RETN Limited, GB |
| 5 | GW-AS210917.retn.net 2a02:2d8:4:2806:232a::1 | 29.7ms | 0% | AS9002 | RETN-AS - RETN Limited, GB |
| 6 | * | - | - | - | |
| 7 | * | - | - | - | |
| 8 | * | - | - | - | |
| 9 | * | - | - | - | |
| 10 | * | - | - | - | |
| 11 | * | - | - | - | |
| 12 | * | - | - | - | |
| 13 | * | - | - | - | |
| 14 | * | - | - | - |
tracepath -6
1?: [LOCALHOST] 0.013ms pmtu 1500
1: _gateway 0.616ms
1: _gateway 0.482ms
2: 2001:7f8:1e::4 0.619ms
3: 2001:7f8:30:0:2:1:0:9002 12.886ms
4: RT.NMX.ROM.IT.retn.net 27.483ms
5: GW-AS210917.retn.net 29.866ms
6: no reply
7: no reply
8: no reply
9: no reply
10: no reply
11: no reply
12: no reply
13: no reply
14: no reply
Too many hops: pmtu 1500
Resume: pmtu 1500 From DE host (Berlin) all blocked
filter likely at: past AS9002 (RETN-AS) · min PMTU on path: 1500
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | xe-0-0-13-178.gw01.ber01.as59645.net 2a06:d1c1:100:b::1 | 0.3ms | 0%* | AS59645 | WYBT-NET - Tobias Fiebig, DE |
| 2 | ae0-2453.cr10.ber01.lwlcom.net 2a06:d1c0::dead:beef:1c02 | 0.5ms | 0%* | AS59645 | WYBT-NET - Tobias Fiebig, DE |
| 3 | retn.bcix.de 2001:7f8:19:1::232a:1 | 10.3ms | 0% | - | NA |
| 4 | RT.NMX.ROM.IT.retn.net 2a02:2d8::57f5:e08f | 29.4ms | 0% | AS9002 | RETN-AS - RETN Limited, GB |
| 5 | GW-AS210917.retn.net 2a02:2d8:4:2806:232a::1 | 73.6ms | 0% | AS9002 | RETN-AS - RETN Limited, GB |
| 6 | * | - | - | - | |
| 7 | * | - | - | - | |
| 8 | * | - | - | - | |
| 9 | * | - | - | - | |
| 10 | * | - | - | - | |
| 11 | * | - | - | - | |
| 12 | * | - | - | - | |
| 13 | * | - | - | - | |
| 14 | * | - | - | - |
tracepath -6
1?: [LOCALHOST] 0.025ms pmtu 1500
1: xe-0-0-13-178.gw01.ber01.as59645.net 0.521ms
1: xe-0-0-13-178.gw01.ber01.as59645.net 0.505ms
2: ae0-2453.cr10.ber01.lwlcom.net 1.049ms
3: retn.bcix.de 28.518ms asymm 5
4: RT.NMX.ROM.IT.retn.net 29.320ms asymm 5
5: GW-AS210917.retn.net 31.949ms asymm 6
6: no reply
7: no reply
8: no reply
9: no reply
10: no reply
11: no reply
12: no reply
13: no reply
14: no reply
Too many hops: pmtu 1500
Resume: pmtu 1500 From DE host (Düsseldorf) all blocked
filter likely at: past AS9002 (RETN-AS) · min PMTU on path: 1500
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | xe-0-0-12-142.gw01.dus01.as59645.net 2a06:d1c1:100:d::1 | 0.2ms | 0%* | AS59645 | WYBT-NET - Tobias Fiebig, DE |
| 2 | eth1-0-12-h5594.edge5-dus1.bb.wiit.network 2001:4ba0:92f4:3::1 | 1.0ms | 0% | AS24961 | MYLOC-AS - WIIT AG, DE |
| 3 | * | - | 0% | - | |
| 4 | lag11.core3-dus1.bb.wiit.network 2001:4ba0:ffe9:115::3 | 0.2ms | 0% | AS24961 | MYLOC-AS - WIIT AG, DE |
| 5 | lag2.core1-dus-ix.bb.wiit.network 2001:4ba0:ffe9:4f::1 | 0.5ms | 0% | AS24961 | MYLOC-AS - WIIT AG, DE |
| 6 | de-cix1.rt.act.fkt.de.retn.net 2001:7f8::232a:0:1 | 4.3ms | 0% | - | NA |
| 7 | RT.NMX.ROM.IT.retn.net 2a02:2d8::57f5:e08f | 23.0ms | 0% | AS9002 | RETN-AS - RETN Limited, GB |
| 8 | GW-AS210917.retn.net 2a02:2d8:4:2806:232a::1 | 29.2ms | 0% | AS9002 | RETN-AS - RETN Limited, GB |
| 9 | * | - | - | - | |
| 10 | * | - | - | - | |
| 11 | * | - | - | - | |
| 12 | * | - | - | - | |
| 13 | * | - | - | - | |
| 14 | * | - | - | - |
tracepath -6
1?: [LOCALHOST] 0.019ms pmtu 1500
1: xe-0-0-12-142.gw01.dus01.as59645.net 0.426ms
1: xe-0-0-12-142.gw01.dus01.as59645.net 0.358ms
2: eth1-0-12-h5594.edge5-dus1.bb.wiit.network 1.337ms
3: no reply
4: lag11.core3-dus1.bb.wiit.network 0.531ms
5: lag8.core1-dus-ix.bb.wiit.network 0.567ms
6: de-cix1.rt.act.fkt.de.retn.net 4.451ms asymm 4
7: RT.NMX.ROM.IT.retn.net 22.895ms asymm 4
8: GW-AS210917.retn.net 36.592ms asymm 5
9: no reply
10: no reply
11: no reply
12: no reply
13: no reply
14: no reply
Too many hops: pmtu 1500
Resume: pmtu 1500 From NL host (go6lab) all blocked
filter likely at: past AS9002 (RETN-AS) · min PMTU on path: 1500
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | 2a00:8642:42::2 | 1.0ms | 0% | AS203993 | GNA-DC1-AS - S.J.M. Steffann, NL |
| 2 | * | - | 0%* | - | |
| 3 | 2a00:1ca8:1::194 | 2.9ms | 0% | AS50673 | Serverius-as - Serverius Holding B.V., NL |
| 4 | 2a03:3f40::10:33 | 5.1ms | 0% | AS50673 | Serverius-as - Serverius Holding B.V., NL |
| 5 | ams-ix.retn.net 2001:7f8:1::a500:9002:1 | 6.4ms | 0% | - | NA |
| 6 | RT.NMX.ROM.IT.retn.net 2a02:2d8::57f5:e08f | 30.1ms | 0% | AS9002 | RETN-AS - RETN Limited, GB |
| 7 | GW-AS210917.retn.net 2a02:2d8:4:2806:232a::1 | 33.3ms | 0% | AS9002 | RETN-AS - RETN Limited, GB |
| 8 | * | - | - | - | |
| 9 | * | - | - | - | |
| 10 | * | - | - | - | |
| 11 | * | - | - | - | |
| 12 | * | - | - | - | |
| 13 | * | - | - | - | |
| 14 | * | - | - | - |
tracepath -6
1?: [LOCALHOST] 0.127ms pmtu 1500
1: 2a00:8642:42::2 2.444ms
1: 2a00:8642:42::2 1.704ms
2: no reply
3: 2a00:1ca8:1::194 5.150ms
4: 2a03:3f40::10:33 9.889ms
5: ams-ix.retn.net 6.293ms asymm 7
6: RT.NMX.ROM.IT.retn.net 31.329ms
7: GW-AS210917.retn.net 36.436ms
8: no reply
9: no reply
10: no reply
11: no reply
12: no reply
13: no reply
14: no reply
Too many hops: pmtu 1500
Resume: pmtu 1500 From ITA host (Karsolink) all blocked
filter likely at: past AS9002 (RETN-AS) · min PMTU on path: 1500
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | * | - | 0%* | - | |
| 2 | 2a12:d8c0:109f:121::a1 | 0.3ms | 0%* | AS204471 | KARSOLINK - 2S Computers SRL, IT |
| 3 | 2a12:d8c0:109f:106::a2 | 3.2ms | 30% | AS204471 | KARSOLINK - 2S Computers SRL, IT |
| 4 | 2a02:2d8:4:1815:232a | 27.4ms | 0% | - | |
| 5 | RT.NMX.ROM.IT.retn.net 2a02:2d8::57f5:e08f | 10.1ms | 0% | AS9002 | RETN-AS - RETN Limited, GB |
| 6 | GW-AS210917.retn.net 2a02:2d8:4:2806:232a::1 | 37.9ms | 0% | AS9002 | RETN-AS - RETN Limited, GB |
| 7 | * | - | - | - | |
| 8 | * | - | - | - | |
| 9 | * | - | - | - | |
| 10 | * | - | - | - | |
| 11 | * | - | - | - | |
| 12 | * | - | - | - | |
| 13 | * | - | - | - | |
| 14 | * | - | - | - |
Rate-limited ICMPv6: hop 3 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).
tracepath -6
1?: [LOCALHOST] 0.032ms pmtu 1500
1: karsolink-01.net.karsolink.com 0.695ms
1: no reply
2: 2a12:d8c0:109f:121::a1 0.683ms
3: 2a12:d8c0:109f:106::a2 3.667ms
4: ae8-202.RT.CLR.MIL.IT.retn.net 8.165ms asymm 5
5: RT.NMX.ROM.IT.retn.net 15.077ms
6: GW-AS210917.retn.net 58.393ms
7: no reply
8: no reply
9: no reply
10: no reply
11: no reply
12: no reply
13: no reply
14: no reply
Too many hops: pmtu 1500
Resume: pmtu 1500 From SLO host (6connect) all blocked
filter likely at: past AS9002 (RETN-AS) · 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 | 0.4ms | 0%* | AS8038 | 6CONNECT - 6connect, Inc., US |
| 2 | * | - | - | - | |
| 3 | * | - | 40% | - | |
| 4 | 2a00:ee0:1:15::2 | 1.3ms | 0% | AS5603 | SIOL-NET - Telekom Slovenije, d.d., SI |
| 5 | de-cix1.rt.act.fkt.de.retn.net 2001:7f8::232a:0:1 | 14.0ms | 0% | - | NA |
| 6 | RT.NMX.ROM.IT.retn.net 2a02:2d8::57f5:e08f | 26.1ms | 0% | AS9002 | RETN-AS - RETN Limited, GB |
| 7 | GW-AS210917.retn.net 2a02:2d8:4:2806:232a::1 | 203.2ms | 0% | AS9002 | RETN-AS - RETN Limited, GB |
| 8 | * | - | - | - | |
| 9 | * | - | - | - | |
| 10 | * | - | - | - | |
| 11 | * | - | - | - | |
| 12 | * | - | - | - | |
| 13 | * | - | - | - | |
| 14 | * | - | - | - |
Rate-limited ICMPv6: hop 3 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).
tracepath -6
1?: [LOCALHOST] 0.018ms pmtu 9000
1: fw1-lju.6connect.com 0.869ms
1: fw1-lju.6connect.com 0.521ms
2: no reply
3: 2a00:ee1:800:9::1 2.582ms
4: 2a00:ee0:1:15::2 1.552ms asymm 3
5: 2a00:ee0:1:15::2 1.535ms pmtu 1500
5: de-cix1.rt.act.fkt.de.retn.net 15.773ms asymm 9
6: RT.NMX.ROM.IT.retn.net 26.052ms asymm 9
7: GW-AS210917.retn.net 28.113ms asymm 10
8: no reply
9: no reply
10: no reply
11: no reply
12: no reply
13: no reply
14: no reply
Too many hops: pmtu 1500From SLO host (T-2) all blocked
filter likely at: past AS9002 (RETN-AS) · min PMTU on path: 1500
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | 2a01:261:313:b814::1 | 0.5ms | 0%* | AS34779 | T-2-AS - T-2, d.o.o., SI |
| 2 | 2a01:260:1::225 | 2.9ms | 0%* | AS34779 | T-2-AS - T-2, d.o.o., SI |
| 3 | 2a01-260-1-1--9a.core6.t-2.net 2a01:260:1:1::9a | 2.5ms | 0%* | AS34779 | T-2-AS - T-2, d.o.o., SI |
| 4 | 2a01-260-1-1--c.core6.t-2.net 2a01:260:1:1::c | 4.2ms | 0%* | AS34779 | T-2-AS - T-2, d.o.o., SI |
| 5 | 2001:7f8:30:0:2:1:0:9002 | 7.7ms | 0%* | - | NA |
| 6 | 2001:7f8:30:0:2:1:0:9002 | 8.5ms | 0% | - | NA |
| 7 | GW-AS210917.retn.net 2a02:2d8:4:2806:232a::1 | 29.1ms | 0% | AS9002 | RETN-AS - RETN Limited, GB |
| 8 | GW-AS210917.retn.net 2a02:2d8:4:2806:232a::1 | 28.8ms | 0% | AS9002 | RETN-AS - RETN Limited, GB |
| 9 | * | - | - | - | |
| 10 | * | - | - | - | |
| 11 | * | - | - | - | |
| 12 | * | - | - | - | |
| 13 | * | - | - | - | |
| 14 | * | - | - | - |
tracepath -6
1?: [LOCALHOST] 0.031ms pmtu 1500
1: no reply
2: 2a01:260:1::225 5.143ms
3: 2a01-260-1-1--9c.core6.t-2.net 2.635ms
4: 2a01-260-1-1--38.core6.t-2.net 2.422ms asymm 3
5: 2001:7f8:30:0:2:1:0:9002 8.258ms
6: 2001:7f8:30:0:2:1:0:9002 9.580ms asymm 5
7: GW-AS210917.retn.net 25.811ms
8: GW-AS210917.retn.net 31.579ms asymm 7
9: no reply
10: no reply
11: no reply
12: no reply
13: no reply
14: no reply
Too many hops: pmtu 1500
Resume: pmtu 1500