AS overview
Test target: 2a06:63c0::1 · static prefix probe · address space: mixed · prefixes announced: 3
prefix(es): 2a00:e90::/32, 2a06:5b00::/29, 2a06:63c0::/29
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 | ||
2a06:63c0::1 | prb | ✓ | ✓ | refused | refused | - | ✓ | ✓ | refused | refused | - | ✓ | ✓ | refused | refused | - | ✓ | ✓ | ? | ? | - | ✓ | ✓ | refused | refused | - | ✓ | ✓ | refused | refused | - | ✓ | ✓ | refused | refused | - |
SOX peering
SOX member - Selective peering, peering member, since 2015-03-20. IPv6 LAN: 2001:7f8:1e::38. Locations: -.
RPKI & ASPA
3 of 3 prefix(es) covered by a valid ROA.
| Prefix | RPKI state | Reason | Covering VRP(s) |
|---|---|---|---|
2a06:5b00::/29 | ✓ valid | matched VRP (correct origin, length within maxLength) | AS8400 /29 maxLen 29 (ripe) |
2a00:e90::/32 | ✓ valid | matched VRP (correct origin, length within maxLength) | AS8400 /32 maxLen 32 (ripe) |
2a06:63c0::/29 | ✓ valid | matched VRP (correct origin, length within maxLength) | AS8400 /29 maxLen 29 (ripe); AS41937 /29 maxLen 48 (ripe) |
Random-IP probe (yarrp) into the AS' prefixes
We probed 70 arbitrary IPv6 address(es) inside AS8400's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2001:470:0:578::1 at hop 5 - that router answers ICMPv6 Echo. This is not in AS8400's announced prefix; operationally it's the AS-edge / peering interface (often on a SOX 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 2026-09-23T11:08:58Z
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) openRFC 4890 ✓
filter likely at: (none) · min PMTU on path: 1500
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | 2a09:ab81::1 | 0.4ms | 0%* | AS60733 | PERKE-NET - ZORAN PEROVIC trading as Agencija Perke.NET, RS |
| 2 | telekom-srbija.sox.rs @SOX 2001:7f8:1e::38 | 0.4ms | 0% | AS13004 | Serbian Open eXchange |
| 3 | ffff:212 | 1.0ms | 0% | - | |
| 4 | 2a06:63c7::ffff:ffff:ffff:47 | 0.8ms | 0% | AS8400 | TELEKOM-AS - TELEKOM SRBIJA a.d., RS |
tracepath -6
1?: [LOCALHOST] 0.010ms pmtu 1500
1: _gateway 0.577ms
1: _gateway 1.720ms
2: telekom-srbija.sox.rs 0.674ms
3: ::ffff:212.200.183.179 1.375ms asymm 4
4: 2a06:63c7::ffff:ffff:ffff:47 0.992ms reached
Resume: pmtu 1500 hops 4 back 4 From DE host (Berlin) openRFC 4890 ✓
filter likely at: (none) · 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 | 0.6ms | 0%* | AS59645 | WYBT-NET - Tobias Fiebig, DE |
| 3 | retn.bcix.de 2001:7f8:19:1::232a:1 | 10.5ms | 0% | - | NA |
| 4 | * | - | 50% | - | |
| 5 | GW-TelekomSrbija.retn.net 2a02:2d8:0:e002:232a::1 | 26.4ms | 0% | AS9002 | RETN-AS - RETN Limited, GB |
| 6 | * | - | - | - | |
| 7 | 2a06:63c7::ffff:ffff:ffff:47 | 31.8ms | 0% | AS8400 | TELEKOM-AS - TELEKOM SRBIJA a.d., RS |
Rate-limited ICMPv6: hop 4 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).
tracepath -6
1?: [LOCALHOST] 0.017ms pmtu 1500
1: xe-0-0-13-178.gw01.ber01.as59645.net 0.418ms
1: xe-0-0-13-178.gw01.ber01.as59645.net 0.570ms
2: ae0-2453.cr10.ber01.lwlcom.net 0.856ms
3: retn.bcix.de 37.478ms asymm 5
4: RT.BIX.BUD.HU.retn.net 23.708ms asymm 6
5: GW-TelekomSrbija.retn.net 26.904ms asymm 6
6: no reply
7: 2a06:63c7::ffff:ffff:ffff:47 34.943ms reached
Resume: pmtu 1500 hops 7 back 8 From DE host (Düsseldorf) openRFC 4890 ✓
filter likely at: (none) · 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 | 6.1ms | 0% | AS24961 | MYLOC-AS - WIIT AG, DE |
| 3 | lag13.agr3-dus3.bb.wiit.network 2001:4ba0:ffe9:7d::1 | 1.0ms | 0% | AS24961 | MYLOC-AS - WIIT AG, DE |
| 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 | 0.4ms | 0% | AS24961 | MYLOC-AS - WIIT AG, DE |
| 6 | ipv6.de-cix.fra.de.as8400.telekom.rs 2001:7f8::20d0:0:1 | 4.3ms | 0% | - | NA |
| 7 | 2a00:e90::212:200:6:8 | 28.6ms | 0% | AS8400 | TELEKOM-AS - TELEKOM SRBIJA a.d., RS |
| 8 | * | - | - | - | |
| 9 | 2a06:63c7::ffff:ffff:ffff:47 | 30.4ms | 0% | AS8400 | TELEKOM-AS - TELEKOM SRBIJA a.d., RS |
tracepath -6
1?: [LOCALHOST] 0.021ms pmtu 1500
1: xe-0-0-12-142.gw01.dus01.as59645.net 0.407ms
1: xe-0-0-12-142.gw01.dus01.as59645.net 0.319ms
2: eth1-0-12-h5594.edge5-dus1.bb.wiit.network 1.155ms
3: no reply
4: lag30.core3-dus1.bb.wiit.network 0.410ms
5: lag2.core1-dus-ix.bb.wiit.network 0.470ms
6: ipv6.de-cix.fra.de.as8400.telekom.rs 4.253ms
7: 2a00:e90::212:200:6:8 44.029ms asymm 9
8: no reply
9: 2a06:63c7::ffff:ffff:ffff:47 31.047ms reached
Resume: pmtu 1500 hops 9 back 9 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::2 | 3.5ms | 0% | AS203993 | GNA-DC1-AS - S.J.M. Steffann, NL |
| 2 | gw.friends.steffann.nl 2a00:8642:1000:f000::1 | 4.0ms | 0%* | AS203993 | GNA-DC1-AS - S.J.M. Steffann, NL |
| 3 | ccr2-ccr1.dc1.nogalliance.org 2a00:8642:dc1:2::b | 5.0ms | 0% | AS203993 | GNA-DC1-AS - S.J.M. Steffann, NL |
| 4 | 2001:7f8:1::a500:8400:1 | 24.6ms | 0% | - | NA |
| 5 | 2a00:e90::212:200:6:9 | 36.5ms | 0% | AS8400 | TELEKOM-AS - TELEKOM SRBIJA a.d., RS |
| 6 | * | - | - | - | |
| 7 | 2a06:63c7::ffff:ffff:ffff:47 | 32.3ms | 0% | AS8400 | TELEKOM-AS - TELEKOM SRBIJA a.d., RS |
tracepath -6
1?: [LOCALHOST] 0.051ms pmtu 1500
1: 2a00:8642:42::2 3.062ms
1: 2a00:8642:42::2 2.036ms
2: gw.friends.steffann.nl 8.399ms
3: ccr2-ccr1.dc1.nogalliance.org 6.748ms asymm 2
4: 2001:7f8:1::a500:8400:1 26.190ms asymm 5
5: 2a00:e90::212:200:6:9 40.031ms asymm 9
6: no reply
7: 2a06:63c7::ffff:ffff:ffff:47 36.490ms reached
Resume: pmtu 1500 hops 7 back 9 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 | karsolink-01.net.karsolink.com 2a12:d8c0:105a:9001::1 | 0.5ms | 0%* | AS204471 | KARSOLINK - 2S Computers SRL, IT |
| 2 | 2a12:d8c0:109f:121::a1 | 0.3ms | 0%* | AS204471 | KARSOLINK - 2S Computers SRL, IT |
| 3 | 2a12:d8c0:101f:103::1 | 8.4ms | 80% | AS204471 | KARSOLINK - 2S Computers SRL, IT |
| 4 | 2a03:b020:1:51::a | 10.0ms | 0% | AS41327 | FIBERTELECOM-AS - Fiber Telecom S.p.A., IT |
| 5 | 2a03:b020::224 | 18.9ms | 60% | AS41327 | FIBERTELECOM-AS - Fiber Telecom S.p.A., IT |
| 6 | ipv6.de-cix.fra.de.as8400.telekom.rs 2001:7f8::20d0:0:1 | 17.1ms | 0% | - | NA |
| 7 | 2a00:e90::212:200:6:8 | 29.1ms | - | AS8400 | TELEKOM-AS - TELEKOM SRBIJA a.d., RS |
| 8 | 2a06:63c7::ffff:ffff:ffff:47 | 24.8ms | 0% | AS8400 | TELEKOM-AS - TELEKOM SRBIJA a.d., RS |
Rate-limited ICMPv6: hop 3, hop 5 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).
tracepath -6
1?: [LOCALHOST] 0.029ms pmtu 1500
1: karsolink-01.net.karsolink.com 1.185ms
1: karsolink-01.net.karsolink.com 0.683ms
2: 2a12:d8c0:109f:121::a1 0.977ms
3: 2a12:d8c0:101f:103::1 9.910ms
4: ae0-303.rt.vsx.pda.it.retn.net 43.068ms
5: 2a03:b020::224 19.461ms
6: ipv6.de-cix.fra.de.as8400.telekom.rs 24.237ms
7: 2a00:e90::212:200:6:8 29.806ms asymm 8
8: 2a06:63c7::ffff:ffff:ffff:47 24.982ms reached
Resume: pmtu 1500 hops 8 back 8 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 | * | - | - | - | |
| 3 | 2a03:a100:0:201:1::1 | 0.8ms | 0% | AS56635 | XENYA - XENYA inzeniring, proizvodnja in trgovina, d.o.o. Ljubljana, SI |
| 4 | e0-1.core1.lju1.he.net 2001:470:1:5be::1 | 2.3ms | 20% | AS6939 | HURRICANE - Hurricane Electric LLC, US |
| 5 | 100ge0-0-0-5.core1.vie1.he.net 2001:470:0:578::1 | 8.4ms | 0% | AS6939 | HURRICANE - Hurricane Electric LLC, US |
| 6 | 2001:7f8:30:0:2:1:0:8400 | 22.8ms | 0% | - | NA |
| 7 | 2a00:e90::212:200:6:9 | 17.5ms | 0% | AS8400 | TELEKOM-AS - TELEKOM SRBIJA a.d., RS |
| 8 | * | - | - | - | |
| 9 | 2a06:63c7::ffff:ffff:ffff:47 | 17.9ms | 0% | AS8400 | TELEKOM-AS - TELEKOM SRBIJA a.d., RS |
Rate-limited ICMPv6: hop 4 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).
tracepath -6
1?: [LOCALHOST] 0.013ms pmtu 9000
1: fw1-lju.6connect.com 0.513ms
1: fw1-lju.6connect.com 0.451ms
2: ccr-to-fw-ccr1-gw-lju.6connect.com 0.925ms
3: 2a03:a100:0:201:1::1 0.922ms
4: 2a03:a100:0:201:1::1 0.894ms pmtu 1500
4: e0-1.core1.lju1.he.net 2.127ms
5: 100ge0-0-0-5.core1.vie1.he.net 8.476ms
6: 2001:7f8:30:0:2:1:0:8400 22.913ms asymm 10
7: 2a00:e90::212:200:6:9 16.925ms asymm 10
8: no reply
9: 2a06:63c7::ffff:ffff:ffff:47 17.524ms reached
Resume: pmtu 1500 hops 9 back 9 From SLO host (T-2) openRFC 4890 ✓
filter likely at: (none) · min PMTU on path: 1500
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | * | - | 0%* | - | |
| 2 | 2a01:260:1::225 | 2.2ms | 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 | 2.2ms | 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 | 4.1ms | 0%* | AS34779 | T-2-AS - T-2, d.o.o., SI |
| 5 | 2001:7f8:30:0:2:1:0:8400 | 8.7ms | 0%* | - | NA |
| 6 | 2a00:e90::212:200:6:9 | 22.8ms | 0% | AS8400 | TELEKOM-AS - TELEKOM SRBIJA a.d., RS |
| 7 | 2a00:e90::212:200:6:9 | 21.2ms | 0% | AS8400 | TELEKOM-AS - TELEKOM SRBIJA a.d., RS |
| 8 | 2a06:63c7::ffff:ffff:ffff:47 | 18.9ms | - | AS8400 | TELEKOM-AS - TELEKOM SRBIJA a.d., RS |
tracepath -6
1?: [LOCALHOST] 0.029ms pmtu 1500
1: 2a01:261:313:b814::1 0.587ms
1: 2a01:261:313:b814::1 0.644ms
2: 2a01:260:1::225 12.696ms
3: 2a01-260-1-1--9c.core6.t-2.net 3.233ms
4: 2a01-260-1-1--c.core6.t-2.net 4.901ms
5: 2001:7f8:30:0:2:1:0:8400 9.287ms
6: 2a00:e90::212:200:6:9 23.317ms asymm 8
7: 2a00:e90::212:200:6:9 23.185ms asymm 8
8: 2a06:63c7::ffff:ffff:ffff:47 18.812ms reached
Resume: pmtu 1500 hops 8 back 7