[REN-BGP-stats-all] IPv4 R&E Routing Table Report - ASREN (R&E) view
REN Routing Table Report
cscora at bgp.nsrc.org
Sun Jul 6 17:05:37 UTC 2025
IPv4 R&E Routing Table Report 17:05 GMT Sun 06 Jul, 2025
IPv4 BGP Table (R&E) as seen at ASREN.
Report Website: https://bgp.nsrc.org/REN
Detailed Analysis: https://bgp.nsrc.org/REN/ASREN/
Analysis Summary
----------------
BGP routing table entries examined: 13353
Prefixes after maximum aggregation (per Origin AS): 7948
Deaggregation factor: 1.68
Unique aggregates announced (without unneeded subnets): 8603
Number of IPv4 prefixes with a valid ROA: 5676
Number of IPv4 prefixes with an invalid ROA: 1
Number of IPv4 prefixes with no ROA: 7676
Total ASes present in the Internet Routing Table: 2041
Prefixes per ASN: 6.54
Origin-only ASes present in the Internet Routing Table: 1771
Origin ASes announcing only one prefix: 821
Transit ASes present in the Internet Routing Table: 270
Transit-only ASes present in the Internet Routing Table: 41
Paths with bogon ASNs present in the IPv4 Routing Table: 0
Average AS path length visible in the Internet Routing Table: 4.5
Max AS path length visible: 14
Max AS path prepend of ASN ( 30116) 10
Prefixes from unregistered ASNs in the Routing Table: 32
Number of instances of unregistered ASNs: 32
Number of 32-bit ASNs allocated by the RIRs: 46782
Number of 32-bit ASNs visible in the Routing Table: 510
Prefixes from 32-bit ASNs in the Routing Table: 1294
Number of bogon 32-bit ASNs visible in the Routing Table: 0
Special use prefixes present in the Routing Table: 0
Prefixes being announced from unallocated address space: 2
Number of addresses announced to Internet: 160640960
Equivalent to 9 /8s, 147 /16s and 47 /24s
Percentage of available address space announced: 4.3
Percentage of allocated address space announced: 4.3
Percentage of available address space allocated: 100.0
Percentage of address space in use by end-sites: 99.6
Total number of prefixes smaller than registry allocations: 1497
APNIC Region Analysis Summary
-----------------------------
Prefixes being announced by APNIC Region ASes: 3352
Total APNIC prefixes after maximum aggregation: 1673
APNIC Deaggregation factor: 2.00
Prefixes being announced from the APNIC address blocks: 3351
Unique aggregates announced from the APNIC address blocks: 1804
APNIC Region origin ASes present in the Internet Routing Table: 444
APNIC Prefixes per ASN: 7.55
APNIC Region origin ASes announcing only one prefix: 207
APNIC Region transit ASes present in the Internet Routing Table: 41
Average APNIC Region AS path length visible: 4.1
Max APNIC Region AS path length visible: 13
Number of APNIC region 32-bit ASNs visible in the Routing Table: 199
Number of APNIC addresses announced to Internet: 37149248
Equivalent to 2 /8s, 54 /16s and 218 /24s
APNIC AS Blocks 4608-4864, 7467-7722, 9216-10239, 17408-18431
(pre-ERX allocations) 23552-24575, 37888-38911, 45056-46079, 55296-56319,
58368-59391, 63488-64098, 64297-64395, 131072-155961
APNIC Address Blocks 1/8, 14/8, 27/8, 36/8, 39/8, 42/8, 43/8,
49/8, 58/8, 59/8, 60/8, 61/8, 101/8, 103/8,
106/8, 110/8, 111/8, 112/8, 113/8, 114/8, 115/8,
116/8, 117/8, 118/8, 119/8, 120/8, 121/8, 122/8,
123/8, 124/8, 125/8, 126/8, 133/8, 150/8, 153/8,
163/8, 171/8, 175/8, 180/8, 182/8, 183/8, 202/8,
203/8, 210/8, 211/8, 218/8, 219/8, 220/8, 221/8,
222/8, 223/8,
ARIN Region Analysis Summary
----------------------------
Prefixes being announced by ARIN Region ASes: 5727
Total ARIN prefixes after maximum aggregation: 3380
ARIN Deaggregation factor: 1.69
Prefixes being announced from the ARIN address blocks: 5774
Unique aggregates announced from the ARIN address blocks: 3756
ARIN Region origin ASes present in the Internet Routing Table: 896
ARIN Prefixes per ASN: 6.44
ARIN Region origin ASes announcing only one prefix: 312
ARIN Region transit ASes present in the Internet Routing Table: 115
Average ARIN Region AS path length visible: 5.0
Max ARIN Region AS path length visible: 14
Number of ARIN region 32-bit ASNs visible in the Routing Table: 137
Number of ARIN addresses announced to Internet: 64761952
Equivalent to 3 /8s, 220 /16s and 48 /24s
ARIN AS Blocks 1-1876, 1902-2042, 2044-2046, 2048-2106
(pre-ERX allocations) 2138-2584, 2615-2772, 2823-2829, 2880-3153
3354-4607, 4865-5119, 5632-6655, 6912-7466
7723-8191, 10240-12287, 13312-15359, 16384-17407
18432-20479, 21504-23551, 25600-26591,
26624-27647, 29696-30719, 31744-33791
35840-36863, 39936-40959, 46080-47103
53248-55295, 62464-63487, 64198-64296, 393216-402332
ARIN Address Blocks 3/8, 4/8, 6/8, 7/8, 8/8, 9/8, 11/8,
12/8, 13/8, 15/8, 16/8, 17/8, 18/8, 19/8,
20/8, 21/8, 22/8, 23/8, 24/8, 26/8, 28/8,
29/8, 30/8, 32/8, 33/8, 34/8, 35/8, 38/8,
40/8, 44/8, 45/8, 47/8, 48/8, 50/8, 52/8,
54/8, 55/8, 56/8, 63/8, 64/8, 65/8, 66/8,
67/8, 68/8, 69/8, 70/8, 71/8, 72/8, 73/8,
74/8, 75/8, 76/8, 96/8, 97/8, 98/8, 99/8,
100/8, 104/8, 107/8, 108/8, 128/8, 129/8, 130/8,
131/8, 132/8, 134/8, 135/8, 136/8, 137/8, 138/8,
139/8, 140/8, 142/8, 143/8, 144/8, 146/8, 147/8,
148/8, 149/8, 152/8, 155/8, 156/8, 157/8, 158/8,
159/8, 160/8, 161/8, 162/8, 164/8, 165/8, 166/8,
167/8, 168/8, 169/8, 170/8, 172/8, 173/8, 174/8,
184/8, 192/8, 198/8, 199/8, 204/8, 205/8, 206/8,
207/8, 208/8, 209/8, 214/8, 215/8, 216/8,
RIPE Region Analysis Summary
----------------------------
Prefixes being announced by RIPE Region ASes: 3143
Total RIPE prefixes after maximum aggregation: 2593
RIPE Deaggregation factor: 1.21
Prefixes being announced from the RIPE address blocks: 3132
Unique aggregates announced from the RIPE address blocks: 2641
RIPE Region origin ASes present in the Internet Routing Table: 567
RIPE Prefixes per ASN: 5.52
RIPE Region origin ASes announcing only one prefix: 259
RIPE Region transit ASes present in the Internet Routing Table: 88
Average RIPE Region AS path length visible: 3.8
Max RIPE Region AS path length visible: 12
Number of RIPE region 32-bit ASNs visible in the Routing Table: 133
Number of RIPE addresses announced to Internet: 56311936
Equivalent to 3 /8s, 91 /16s and 64 /24s
RIPE AS Blocks 1877-1901, 2043, 2047, 2107-2136, 2585-2614
(pre-ERX allocations) 2773-2822, 2830-2879, 3154-3353, 5377-5631
6656-6911, 8192-9215, 12288-13311, 15360-16383
20480-21503, 24576-25599, 28672-29695
30720-31743, 33792-35839, 38912-39935
40960-45055, 47104-52223, 56320-58367
59392-61439, 61952-62463, 64396-64495
196608-216475
RIPE Address Blocks 2/8, 5/8, 25/8, 31/8, 37/8, 46/8, 51/8,
53/8, 57/8, 62/8, 77/8, 78/8, 79/8, 80/8,
81/8, 82/8, 83/8, 84/8, 85/8, 86/8, 87/8,
88/8, 89/8, 90/8, 91/8, 92/8, 93/8, 94/8,
95/8, 109/8, 141/8, 145/8, 151/8, 176/8, 178/8,
185/8, 188/8, 193/8, 194/8, 195/8, 212/8, 213/8,
217/8,
LACNIC Region Analysis Summary
------------------------------
Prefixes being announced by LACNIC Region ASes: 634
Total LACNIC prefixes after maximum aggregation: 243
LACNIC Deaggregation factor: 2.61
Prefixes being announced from the LACNIC address blocks: 630
Unique aggregates announced from the LACNIC address blocks: 316
LACNIC Region origin ASes present in the Internet Routing Table: 60
LACNIC Prefixes per ASN: 10.50
LACNIC Region origin ASes announcing only one prefix: 25
LACNIC Region transit ASes present in the Internet Routing Table: 14
Average LACNIC Region AS path length visible: 4.4
Max LACNIC Region AS path length visible: 8
Number of LACNIC region 32-bit ASNs visible in the Routing Table: 23
Number of LACNIC addresses announced to Internet: 1790368
Equivalent to 0 /8s, 27 /16s and 81 /24s
LACNIC AS Blocks 26592-26623, 27648-28671, 52224-53247,
61440-61951, 64099-64197, 262144-274844 + ERX transfers
LACNIC Address Blocks 177/8, 179/8, 181/8, 186/8, 187/8, 189/8, 190/8,
191/8, 200/8, 201/8,
AfriNIC Region Analysis Summary
-------------------------------
Prefixes being announced by AfriNIC Region ASes: 465
Total AfriNIC prefixes after maximum aggregation: 55
AfriNIC Deaggregation factor: 8.45
Prefixes being announced from the AfriNIC address blocks: 464
Unique aggregates announced from the AfriNIC address blocks: 84
AfriNIC Region origin ASes present in the Internet Routing Table: 32
AfriNIC Prefixes per ASN: 14.50
AfriNIC Region origin ASes announcing only one prefix: 18
AfriNIC Region transit ASes present in the Internet Routing Table: 6
Average AfriNIC Region AS path length visible: 5.9
Max AfriNIC Region AS path length visible: 9
Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 18
Number of AfriNIC addresses announced to Internet: 625152
Equivalent to 0 /8s, 9 /16s and 138 /24s
AfriNIC AS Blocks 36864-37887, 327680-329727 & ERX transfers
AfriNIC Address Blocks 41/8, 102/8, 105/8, 154/8, 196/8, 197/8,
APNIC Region per AS prefix count summary
----------------------------------------
ASN No of nets /20 equiv MaxAgg Description
2907 606 2169 462 SINET-AS Research Organization of Informa
7497 452 180 23 CSTNET-AS-AP Computer Network Information
4538 190 4192 71 ERX-CERNET-BKB China Education and Resear
58647 182 18 2 KAGAWAU-AS Kagawa University, JP
7575 172 281 116 AARNET-AS-AP Australian Academic and Rese
55824 148 19 21 NKN-CORE-NW NKN Core Network, IN
6262 53 133 46 CSIRO Commonwealth Scientific and Industr
38280 50 3 2 MONASHUNI-MY-AS-AP Monash University Sunw
45773 48 3 5 HECPERN-AS-PK PERN AS Content Servie Prov
132524 42 9 10 TIFR-AS Tata Institute of Fundamental Res
Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-APNIC
ARIN Region per AS prefix count summary
---------------------------------------
ASN No of nets /20 equiv MaxAgg Description
5786 200 16 1 UPRENET, PR
376 179 145 139 RISQ-AS, CA
2920 176 34 7 LACOE, US
2152 146 491 96 CENIC-2152, US
18558 139 18 4 NETBLK-RCOEK, US
81 103 399 30 NCREN, US
23024 99 7 17 OCDE, US
21976 88 34 14 NJEDGE-NET, US
1736 79 16 1 MU-AS, US
22742 67 37 32 CT-EDU-NET, US
Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-ARIN
RIPE Region per AS prefix count summary
---------------------------------------
ASN No of nets /20 equiv MaxAgg Description
680 284 1899 250 DFN Verein zur Foerderung eines Deutschen
786 193 1742 187 JANET Jisc Services Limited, GB
559 114 533 104 SWITCH Peering requests: peering at switch.c
1103 96 1487 83 SURFNET-NL SURFnet, The Netherlands, NL
2614 92 26 69 ROEDUNET, RO
137 82 677 77 ASGARR Consortium GARR, IT
1930 79 88 74 RCCN Fundacao para a Ciencia e a Tecnolog
553 75 366 75 BELWUE BelWue-Koordination, DE
2200 63 614 58 FR-RENATER Reseau National de telecommuni
200521 59 4 24 SEAP-AGE, ES
Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-RIPE
LACNIC Region per AS prefix count summary
-----------------------------------------
ASN No of nets /20 equiv MaxAgg Description
1916 294 172 31 Rede Nacional de Ensino e Pesquisa, BR
11340 110 25 52 Red Universitaria Nacional, CL
2715 38 35 29 Fundacao Carlos Chagas Filho de Amparo a
20191 26 16 1 Pontificia Universidad Catolica de Chile,
28571 19 40 18 UNIVERSIDADE DE SAO PAULO, BR
52888 12 7 7 UNIVERSIDADE FEDERAL DE SAO CARLOS, BR
61468 11 1 10 CEDIA, EC
2716 10 28 9 Universidade Federal do Rio Grande do Sul
21612 9 1 8 FUNDACAO INSTITUTO OSWALDO CRUZ, BR
28027 7 2 1 Escuela Superior Politecnica del Litoral,
Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-LACNIC
AfriNIC Region per AS prefix count summary
------------------------------------------
ASN No of nets /20 equiv MaxAgg Description
36914 330 82 3 KENET-AS, KE
37215 37 8 1 MAREN, MW
6879 24 2 9 ENSTINET-, EG
30983 12 4 2 MARWAN-AS, MA
327700 11 16 1 MoRENet, MZ
37654 10 1 6 RwEdNet-AS, RW
327947 5 2 3 KNUST-, GH
327798 4 0 3 BERNET, BI
37661 3 6 3 NRaE1-AS, NG
327992 3 1 2 GHANAIAN-ACADEMIC-AND-RESEARCH-NETWORK, G
Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-AFRINIC
Global Per AS prefix count summary
----------------------------------
ASN No of nets /20 equiv MaxAgg Description
2907 606 2169 462 SINET-AS Research Organization of Informa
7497 452 180 23 CSTNET-AS-AP Computer Network Information
36914 330 82 3 KENET-AS, KE
1916 294 172 31 Rede Nacional de Ensino e Pesquisa, BR
680 284 1899 250 DFN Verein zur Foerderung eines Deutschen
5786 200 16 1 UPRENET, PR
786 193 1742 187 JANET Jisc Services Limited, GB
4538 190 4192 71 ERX-CERNET-BKB China Education and Resear
58647 182 18 2 KAGAWAU-AS Kagawa University, JP
376 179 145 139 RISQ-AS, CA
Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet
Global Per AS Maximum Aggregation summary
-----------------------------------------
ASN No of nets Net Savings Description
7497 452 429 CSTNET-AS-AP Computer Network Information Cente
36914 330 327 KENET-AS, KE
1916 294 263 Rede Nacional de Ensino e Pesquisa, BR
5786 200 199 UPRENET, PR
58647 182 180 KAGAWAU-AS Kagawa University, JP
2920 176 169 LACOE, US
18558 139 135 NETBLK-RCOEK, US
55824 148 127 NKN-CORE-NW NKN Core Network, IN
4538 190 119 ERX-CERNET-BKB China Education and Research Net
23024 99 82 OCDE, US
Complete listing at https://bgp.nsrc.org/REN/ASREN/data-CIDRnet
List of Unregistered Origin ASNs (Global)
-----------------------------------------
Bad AS Designation Net Originated Transit AS Transit AS Name
26898 UNALLOCATED 131.187.248.0/22 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.248.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.249.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.250.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.251.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 198.30.187.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 208.108.80.0/20 3112 OARNET-AS-1, US
26898 UNALLOCATED 208.108.80.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 208.108.81.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 208.108.82.0/24 3112 OARNET-AS-1, US
Complete listing at https://bgp.nsrc.org/REN/ASREN/data-badAS
Advertised Unallocated Addresses
--------------------------------
Unassigned Network ASN Information AS Name
164.160.192.0/21 Origin: 37661 NRaE1-AS, NG
164.160.192.0/21 Transit: 37288 WACREN, SN
203.9.156.0/24 Origin: 1851 ADELAIDE-UNIVERSITY-AS-AP The University
203.9.156.0/24 Transit: 7575 AARNET-AS-AP Australian Academic and Res
Complete listing at https://bgp.nsrc.org/REN/ASREN/data-add-IANA
Number of prefixes announced per prefix length (Global)
-------------------------------------------------------
/1:0 /2:0 /3:0 /4:0 /5:0 /6:0
/7:0 /8:0 /9:1 /10:1 /11:0 /12:9
/13:16 /14:30 /15:96 /16:1599 /17:287 /18:311
/19:421 /20:597 /21:594 /22:998 /23:1100 /24:7135
/25:52 /26:76 /27:30 /28:0 /29:0 /30:0
/31:0 /32:0
Advertised prefixes smaller than registry allocations
-----------------------------------------------------
ASN No of nets Total ann. Description
36914 309 330 KENET-AS, KE
1916 83 294 Rede Nacional de Ensino e Pesquisa, BR
23024 38 99 OCDE, US
200521 34 59 SEAP-AGE, ES
37215 31 37 MAREN, MW
25977 27 31 HCCS, US
32440 26 50 LONI, US
26898 24 64 RESERVED, ZZ
36794 24 26 META SOLUTIONS PIKETON, US
60187 23 48 LGFL-AS, GB
Complete listing at https://bgp.nsrc.org/REN/ASREN/data-sXXas-nos
Number of /24s announced per /8 block (Global)
----------------------------------------------
1:1 5:16 8:2 12:1 14:93 23:4
24:2 31:1 35:1 37:13 38:4 40:1
41:89 42:13 44:4 45:25 46:5 47:1
49:12 58:16 59:17 60:6 61:2 62:5
63:3 64:29 66:19 67:31 68:1 69:9
70:2 72:7 74:16 76:31 77:6 78:3
79:9 80:8 81:26 82:2 83:7 84:6
85:31 87:1 89:10 91:35 93:15 94:2
95:1 96:5 98:2 101:2 102:2 103:290
104:76 108:4 109:1 111:17 114:1 116:6
118:33 119:31 121:28 122:8 123:8 124:42
128:31 129:36 130:93 131:52 132:45 133:156
134:77 136:198 137:43 138:10 139:4 140:26
141:2 142:22 143:12 144:7 145:2 146:122
147:13 148:8 149:10 150:8 151:4 152:112
153:13 154:15 155:39 156:128 157:10 158:24
159:116 160:34 161:9 162:17 163:72 164:10
165:3 167:9 168:12 169:5 170:11 173:5
175:1 177:2 179:3 180:16 182:1 184:6
185:38 187:6 188:14 190:1 191:3 192:1156
193:250 194:84 195:67 196:11 197:256 198:340
199:194 200:177 201:3 202:343 203:193 204:320
205:86 206:158 207:197 208:46 209:95 210:101
211:2 212:44 213:4 216:52 217:22 219:7
220:3 222:3 223:5
End of report
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