AS overview
Test target: 2a02:2951::1 · static prefix probe · address space: mixed · prefixes announced: 1
prefix(es): 2a02:2951::/32
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 | ||
2a02:2951::1 | prb | ✓ | ✓ | ? | ? | ✓ | ✓ | ✓ | ? | ? | ✓ | ✓ | ✓ | ? | ? | ✓ | ✓ | ✓ | ? | ? | ✓ | ✓ | ✓ | ? | ? | ✓ | ✓ | ✓ | ? | ? | ✓ | ✓ | ✓ | ? | ? | ✓ |
SOX peering
Not an SOX member, but our traceroute path crosses the SOX LAN from SRB host (SOX, Belgrade) - reached via an SOX-resident transit operator.
RPKI & ASPA
1 of 1 prefix(es) covered by a valid ROA.
| Prefix | RPKI state | Reason | Covering VRP(s) |
|---|---|---|---|
2a02:2951::/32 | ✓ valid | matched VRP (correct origin, length within maxLength) | AS56843 /32 maxLen 32 (ripe) |
Random-IP probe (yarrp) into the AS' prefixes
We probed 35 arbitrary IPv6 address(es) inside AS56843's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2a02:b58:1:15::2 at hop 8 - that router answers ICMPv6 Echo. This is not in AS56843'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 2026-09-23T11:08:31Z
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 | 0.2ms | 0%* | AS60733 | PERKE-NET - ZORAN PEROVIC trading as Agencija Perke.NET, RS |
| 2 | orion.sox.rs @SOX 2001:7f8:1e::23 | 19.6ms | 80% | AS9125 | Orion Telekom |
| 3 | 2a02:b58:1:15::2 | 19.6ms | 80% | AS9125 | ORIONTELEKOM-AS - Drustvo za telekomunikacije Orion telekom doo Beograd-Zemun, RS |
| 4 | 2a02:660:1:1::12 | 23.7ms | - | AS9125 | ORIONTELEKOM-AS - Drustvo za telekomunikacije Orion telekom doo Beograd-Zemun, RS |
| 5 | 2a02:2951::1 | 24.3ms | - | AS56843 | CNT-ISP-AS - Centar Novih Tehnologija DOO, RS |
Rate-limited ICMPv6: hop 2, hop 3 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).
tracepath -6
1?: [LOCALHOST] 0.019ms pmtu 1500
1: _gateway 0.541ms
1: _gateway 0.285ms
2: no reply
3: no reply
4: ??? 23.459ms asymm 11
5: no reply
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
15: no reply
16: no reply
17: no reply
Too many hops: pmtu 1500
Resume: pmtu 1500 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 | 0.2ms | 0%* | AS59645 | WYBT-NET - Tobias Fiebig, DE |
| 2 | xe-0-0-12-2412.gw01.dus01.as59645.net 2a06:d1c0::dead:beef:401 | 8.4ms | 0% | AS59645 | WYBT-NET - Tobias Fiebig, DE |
| 3 | eth1-0-12-h5594.edge5-dus1.bb.wiit.network 2001:4ba0:92f4:3::1 | 10.3ms | 0% | AS24961 | MYLOC-AS - WIIT AG, DE |
| 4 | lag10-h5f01.agr4-dus1.bb.wiit.network 2001:4ba0:ffe9:7c::1 | 10.1ms | 0% | AS24961 | MYLOC-AS - WIIT AG, DE |
| 5 | lag30.core3-dus1.bb.wiit.network 2001:4ba0:ffe9:109::2 | 8.3ms | 0% | AS24961 | MYLOC-AS - WIIT AG, DE |
| 6 | lag8.core1-dus-ix.bb.wiit.network 2001:4ba0:ffe9:8::2 | 8.4ms | 0% | AS24961 | MYLOC-AS - WIIT AG, DE |
| 7 | * | - | 70% | - | |
| 8 | * | - | 70% | - | |
| 9 | 2a02:660:1:1::12 | 33.6ms | - | AS9125 | ORIONTELEKOM-AS - Drustvo za telekomunikacije Orion telekom doo Beograd-Zemun, RS |
| 10 | 2a02:2951::1 | 36.9ms | - | AS56843 | CNT-ISP-AS - Centar Novih Tehnologija DOO, RS |
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] 0.028ms pmtu 1500
1: xe-0-0-13-178.gw01.ber01.as59645.net 0.489ms
1: xe-0-0-13-178.gw01.ber01.as59645.net 0.443ms
2: xe-0-0-12-2412.gw01.dus01.as59645.net 8.451ms
3: eth1-0-12-h5594.edge5-dus1.bb.wiit.network 9.905ms
4: no reply
5: lag30.core3-dus1.bb.wiit.network 8.663ms
6: lag8.core1-dus-ix.bb.wiit.network 8.852ms
7: 2001:7f8::23a5:0:1 32.036ms
8: ??? 31.188ms
9: ??? 34.158ms
10: no reply
11: no reply
12: no reply
13: no reply
14: no reply
15: no reply
16: no reply
17: no reply
Too many hops: pmtu 1500
Resume: pmtu 1500 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 | 0.1ms | 0%* | AS59645 | WYBT-NET - Tobias Fiebig, DE |
| 2 | eth1-0-12-h5594.edge5-dus1.bb.wiit.network 2001:4ba0:92f4:3::1 | 4.0ms | 0% | AS24961 | MYLOC-AS - WIIT AG, DE |
| 3 | lag13.agr3-dus3.bb.wiit.network 2001:4ba0:ffe9:7d::1 | 2.2ms | 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 | * | - | 70% | - | |
| 7 | * | - | 70% | - | |
| 8 | 2a02:660:1:1::12 | 27.0ms | - | AS9125 | ORIONTELEKOM-AS - Drustvo za telekomunikacije Orion telekom doo Beograd-Zemun, RS |
| 9 | 2a02:2951::1 | 26.9ms | - | AS56843 | CNT-ISP-AS - Centar Novih Tehnologija DOO, RS |
Rate-limited ICMPv6: hop 6, hop 7 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).
tracepath -6
1?: [LOCALHOST] 0.012ms pmtu 1500
1: xe-0-0-12-142.gw01.dus01.as59645.net 0.235ms
1: xe-0-0-12-142.gw01.dus01.as59645.net 0.233ms
2: eth1-0-12-h5594.edge5-dus1.bb.wiit.network 1.840ms
3: no reply
4: lag11.core3-dus1.bb.wiit.network 0.393ms
5: lag8.core1-dus-ix.bb.wiit.network 0.477ms
6: no reply
7: no reply
8: ??? 26.241ms
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
Too many hops: pmtu 1500
Resume: pmtu 1500 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 | 1.2ms | 0% | AS203993 | GNA-DC1-AS - S.J.M. Steffann, NL |
| 2 | * | - | 0%* | - | |
| 3 | 2a00:1ca8:1::194 | 3.4ms | 0% | AS50673 | Serverius-as - Serverius Holding B.V., NL |
| 4 | 2a03:3f40::10:33 | 7.6ms | 0% | AS50673 | Serverius-as - Serverius Holding B.V., NL |
| 5 | ae22-404.ams10.core-backbone.com 2a01:4a0:1338:155::1 | 6.2ms | 0% | AS201011 | CORE-BACKBONE - Core-Backbone GmbH, DE |
| 6 | ae16-2074.fra10.core-backbone.com 2a01:4a0:0:2074::3 | 14.5ms | 0% | AS201011 | CORE-BACKBONE - Core-Backbone GmbH, DE |
| 7 | ae2-2021.fra20.core-backbone.com 2a01:4a0:0:2021::4 | 14.2ms | 0% | AS201011 | CORE-BACKBONE - Core-Backbone GmbH, DE |
| 8 | 2001:7f8::23a5:0:1 | 33.6ms | 70% | - | NA |
| 9 | 2a02:b58:1:15::2 | 33.2ms | 70% | AS9125 | ORIONTELEKOM-AS - Drustvo za telekomunikacije Orion telekom doo Beograd-Zemun, RS |
| 10 | 2a02:660:1:1::12 | 36.6ms | - | AS9125 | ORIONTELEKOM-AS - Drustvo za telekomunikacije Orion telekom doo Beograd-Zemun, RS |
| 11 | 2a02:2951::1 | 40.4ms | - | AS56843 | CNT-ISP-AS - Centar Novih Tehnologija DOO, RS |
Rate-limited ICMPv6: hop 8, hop 9 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).
tracepath -6
1?: [LOCALHOST] 0.135ms pmtu 1500
1: 2a00:8642:42::2 1.245ms
1: 2a00:8642:42::2 4.073ms
2: gw.friends.steffann.nl 2.444ms
3: 2a00:1ca8:1::194 3.697ms
4: 2a03:3f40::10:33 10.731ms
5: ae22-404.ams10.core-backbone.com 8.400ms
6: ae16-2074.fra10.core-backbone.com 12.044ms
7: ae2-2021.fra20.core-backbone.com 12.037ms
8: no reply
9: no reply
10: ??? 35.101ms asymm 9
11: no reply
12: no reply
13: no reply
14: no reply
15: no reply
16: no reply
17: 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 | 2a03:b020:1:51::a | 10.0ms | 0% | AS41327 | FIBERTELECOM-AS - Fiber Telecom S.p.A., IT |
| 5 | 2a03:b020::224 | 18.6ms | 0% | AS41327 | FIBERTELECOM-AS - Fiber Telecom S.p.A., IT |
| 6 | 2001:7f8::23a5:0:1 | 37.6ms | 0% | - | NA |
| 7 | 2a02:b58:1:15::2 | 35.9ms | 0% | AS9125 | ORIONTELEKOM-AS - Drustvo za telekomunikacije Orion telekom doo Beograd-Zemun, RS |
| 8 | 2a02:660:1:1::12 | 39.2ms | - | AS9125 | ORIONTELEKOM-AS - Drustvo za telekomunikacije Orion telekom doo Beograd-Zemun, RS |
| 9 | 2a02:2951::1 | 39.7ms | - | AS56843 | CNT-ISP-AS - Centar Novih Tehnologija DOO, RS |
tracepath -6
1?: [LOCALHOST] 0.029ms pmtu 1500
1: no reply
2: 2a12:d8c0:109f:121::a1 0.659ms
3: 2a12:d8c0:101f:6::1 9.889ms
4: 2a03:b020:1:51::a 10.437ms
5: 2a03:b020::224 19.093ms
6: 2001:7f8::23a5:0:1 36.591ms
7: ??? 36.593ms
8: ??? 40.417ms
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
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 | * | - | - | - | |
| 3 | 2a00:ee1:800:9::1 | 1.9ms | 30% | AS5603 | SIOL-NET - Telekom Slovenije, d.d., SI |
| 4 | 2a00:ee0:1:10::2 | 1.1ms | 0% | AS5603 | SIOL-NET - Telekom Slovenije, d.d., SI |
| 5 | * | - | 10% | - | |
| 6 | * | - | 10% | - | |
| 7 | 2a02:660:1:1::12 | 36.9ms | - | AS9125 | ORIONTELEKOM-AS - Drustvo za telekomunikacije Orion telekom doo Beograd-Zemun, RS |
| 8 | 2a02:2951::1 | 37.1ms | - | AS56843 | CNT-ISP-AS - Centar Novih Tehnologija DOO, RS |
Rate-limited ICMPv6: hop 3, hop 5, hop 6 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).
tracepath -6
1?: [LOCALHOST] 0.026ms pmtu 9000
1: fw1-lju.6connect.com 0.559ms
1: fw1-lju.6connect.com 0.423ms
2: no reply
3: 2a00:ee1:800:9::1 2.504ms
4: 2a00:ee0:1:15::2 1.317ms asymm 3
5: 2a00:ee0:1:15::2 2.382ms pmtu 1500
5: 2001:7f8::23a5:0:1 32.649ms asymm 9
6: ??? 33.070ms asymm 10
7: ??? 37.356ms asymm 11
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
Too many hops: pmtu 1500From 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 | * | - | - | - | |
| 2 | 2a01:260:1::225 | 2.3ms | 0%* | AS34779 | T-2-AS - T-2, d.o.o., SI |
| 3 | 2a01-260-1-1--9c.core6.t-2.net 2a01:260:1:1::9c | 2.7ms | 0%* | AS34779 | T-2-AS - T-2, d.o.o., SI |
| 4 | 2001:7f8:28::64:0 | 5.1ms | 0%* | - | NA |
| 5 | 2001:7f8:28::64:0 | 4.8ms | 0% | - | NA |
| 6 | 2a02:2608:ffff:ffff:185:151:132:231 | 10.5ms | 0% | AS44306 | Omonia - OMONIA d.o.o., HR |
| 7 | * | - | 50% | - | |
| 8 | 2a02:660:1:1::12 | 19.3ms | 50% | AS9125 | ORIONTELEKOM-AS - Drustvo za telekomunikacije Orion telekom doo Beograd-Zemun, RS |
| 9 | 2a02:2951::1 | 19.8ms | - | AS56843 | CNT-ISP-AS - Centar Novih Tehnologija DOO, RS |
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] 0.028ms pmtu 1500
1: no reply
2: 2a01:260:1::225 7.651ms
3: 2a01-260-1-1--9a.core6.t-2.net 2.538ms
4: 2a01-260-1-1--38.core6.t-2.net 2.331ms asymm 3
5: 2a02:2608:ffff:ffff:185:151:132:231 10.526ms
6: 2a02:2608:ffff:ffff:185:151:132:231 10.148ms asymm 5
7: no reply
8: ??? 19.414ms asymm 7
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
Too many hops: pmtu 1500
Resume: pmtu 1500